diff --git a/typo3/sysext/core/Classes/Imaging/GraphicalFunctions.php b/typo3/sysext/core/Classes/Imaging/GraphicalFunctions.php
index ae0391d72ac533aed065c63980d3b8e3b94a7c40..8afcbefbc8490fed110705940ba6722b5309b6d2 100644
--- a/typo3/sysext/core/Classes/Imaging/GraphicalFunctions.php
+++ b/typo3/sysext/core/Classes/Imaging/GraphicalFunctions.php
@@ -47,9 +47,9 @@ class GraphicalFunctions
     /**
      * File formats supported by gdlib. This variable get's filled in "init" method
      *
-     * @var string
+     * @var array
      */
-    public $gdlibExtensions = '';
+    protected $gdlibExtensions = [];
 
     /**
      * defines the RGB colorspace to use
@@ -100,24 +100,26 @@ class GraphicalFunctions
     public $truecolorColors = 16777215;
 
     /**
-     * Commalist of file extensions perceived as images by TYPO3.
-     * List should be set to 'gif,png,jpeg,jpg' if IM is not available. Lowercase and no spaces between!
+     * Allowed file extensions perceived as images by TYPO3.
+     * List should be set to 'gif,png,jpeg,jpg' if IM is not available.
      *
-     * @var string
+     * @var array
      */
-    public $imageFileExt = 'gif,jpg,jpeg,png,tif,bmp,tga,pcx,ai,pdf';
+    protected $imageFileExt = ['gif', 'jpg', 'jpeg', 'png', 'tif', 'bmp', 'tga', 'pcx', 'ai', 'pdf'];
 
     /**
-     * Commalist of web image extensions (can be shown by a webbrowser)
+     * Web image extensions (can be shown by a webbrowser)
      *
-     * @var string
+     * @var array
      */
-    public $webImageExt = 'gif,jpg,jpeg,png';
+    protected $webImageExt = ['gif', 'jpg', 'jpeg', 'png'];
 
     /**
-     * @var string
+     * Enable ImageMagick effects, disabled by default as IM5+ effects slow down the image generation
+     *
+     * @var bool
      */
-    public $NO_IM_EFFECTS = '';
+    protected $processorEffectsEnabled = false;
 
     /**
      * @var array
@@ -130,14 +132,14 @@ class GraphicalFunctions
     ];
 
     /**
-     * @var string
+     * @var bool
      */
-    public $NO_IMAGE_MAGICK = '';
+    protected $NO_IMAGE_MAGICK = false;
 
     /**
      * @var bool
      */
-    public $mayScaleUp = 1;
+    protected $mayScaleUp = true;
 
     /**
      * Filename prefix for images scaled in imageMagickConvert()
@@ -158,21 +160,14 @@ class GraphicalFunctions
      *
      * @var bool
      */
-    public $dontCheckForExistingTempFile = 0;
+    public $dontCheckForExistingTempFile = false;
 
     /**
      * Prevents imageMagickConvert() from compressing the gif-files with self::gifCompress()
      *
      * @var bool
      */
-    public $dontCompress = 0;
-
-    /**
-     * For debugging ONLY!
-     *
-     * @var bool
-     */
-    public $dontUnlinkTempFiles = 0;
+    public $dontCompress = false;
 
     /**
      * For debugging only.
@@ -202,13 +197,6 @@ class GraphicalFunctions
      */
     protected $saveAlphaLayer = false;
 
-    /**
-     * Prefix for relative paths. Used in "show_item.php" script. Is prefixed the output file name IN imageMagickConvert()
-     *
-     * @var string
-     */
-    public $absPrefix = '';
-
     /**
      * ImageMagick scaling command; "-geometry" or "-sample". Used in makeText() and imageMagickConvert()
      *
@@ -221,28 +209,28 @@ class GraphicalFunctions
      *
      * @var string
      */
-    public $im5fx_blurSteps = '1x2,2x2,3x2,4x3,5x3,5x4,6x4,7x5,8x5,9x5';
+    protected $im5fx_blurSteps = '1x2,2x2,3x2,4x3,5x3,5x4,6x4,7x5,8x5,9x5';
 
     /**
      * Used by v5_sharpen() to simulate 10 continuous steps of sharpening.
      *
      * @var string
      */
-    public $im5fx_sharpenSteps = '1x2,2x2,3x2,2x3,3x3,4x3,3x4,4x4,4x5,5x5';
+    protected $im5fx_sharpenSteps = '1x2,2x2,3x2,2x3,3x3,4x3,3x4,4x4,4x5,5x5';
 
     /**
      * This is the limit for the number of pixels in an image before it will be rendered as JPG instead of GIF/PNG
      *
      * @var int
      */
-    public $pixelLimitGif = 10000;
+    protected $pixelLimitGif = 10000;
 
     /**
      * Array mapping HTML color names to RGB values.
      *
      * @var array
      */
-    public $colMap = [
+    protected $colMap = [
         'aqua' => [0, 255, 255],
         'black' => [0, 0, 0],
         'blue' => [0, 0, 255],
@@ -266,12 +254,12 @@ class GraphicalFunctions
      *
      * @var CharsetConverter
      */
-    public $csConvObj;
+    protected $csConvObj;
 
     /**
      * @var int
      */
-    public $jpegQuality = 85;
+    protected $jpegQuality = 85;
 
     /**
      * @var string
@@ -299,7 +287,7 @@ class GraphicalFunctions
     /**
      * @var array
      */
-    public $OFFSET;
+    protected $OFFSET;
 
     /**
      * @var resource
@@ -314,13 +302,14 @@ class GraphicalFunctions
     {
         $gfxConf = $GLOBALS['TYPO3_CONF_VARS']['GFX'];
         if (function_exists('imagecreatefromjpeg') && function_exists('imagejpeg')) {
-            $this->gdlibExtensions .= ',jpg,jpeg';
+            $this->gdlibExtensions[] = 'jpg';
+            $this->gdlibExtensions[] = 'jpeg';
         }
         if (function_exists('imagecreatefrompng') && function_exists('imagepng')) {
-            $this->gdlibExtensions .= ',png';
+            $this->gdlibExtensions[] = 'png';
         }
         if (function_exists('imagecreatefromgif') && function_exists('imagegif')) {
-            $this->gdlibExtensions .= ',gif';
+            $this->gdlibExtensions[] = 'gif';
         }
 
         if ($gfxConf['processor_colorspace'] && in_array($gfxConf['processor_colorspace'], $this->allowedColorSpaceNames, true)) {
@@ -328,7 +317,7 @@ class GraphicalFunctions
         }
 
         if (!$gfxConf['processor_enabled']) {
-            $this->NO_IMAGE_MAGICK = 1;
+            $this->NO_IMAGE_MAGICK = true;
         }
         // Setting default JPG parameters:
         $this->jpegQuality = MathUtility::forceIntegerInRange($gfxConf['jpg_quality'], 10, 100, 85);
@@ -336,24 +325,21 @@ class GraphicalFunctions
         if ($gfxConf['gdlib_png']) {
             $this->gifExtension = 'png';
         }
-        $this->imageFileExt = $gfxConf['imagefile_ext'];
+        $this->imageFileExt = GeneralUtility::trimExplode(',', $gfxConf['imagefile_ext']);
 
         // Boolean. This is necessary if using ImageMagick 5+.
         // Effects in Imagemagick 5+ tends to render very slowly!!
         // - therefore must be disabled in order not to perform sharpen, blurring and such.
-        $this->NO_IM_EFFECTS = 1;
         $this->cmds['jpg'] = $this->cmds['jpeg'] = '-colorspace ' . $this->colorspace . ' -quality ' . $this->jpegQuality;
 
         // ... but if 'processor_effects' is set, enable effects
         if ($gfxConf['processor_effects']) {
-            $this->NO_IM_EFFECTS = 0;
+            $this->processorEffectsEnabled = true;
             $this->cmds['jpg'] .= $this->v5_sharpen(10);
             $this->cmds['jpeg'] .= $this->v5_sharpen(10);
         }
         // Secures that images are not scaled up.
-        if (!$gfxConf['processor_allowUpscaling']) {
-            $this->mayScaleUp = 0;
-        }
+        $this->mayScaleUp = (bool)$gfxConf['processor_allowUpscaling'];
         $this->csConvObj = GeneralUtility::makeInstance(CharsetConverter::class);
     }
 
@@ -377,14 +363,14 @@ class GraphicalFunctions
         if ($conf['file'] && $conf['mask']) {
             $imgInf = pathinfo($conf['file']);
             $imgExt = strtolower($imgInf['extension']);
-            if (!GeneralUtility::inList($this->gdlibExtensions, $imgExt)) {
+            if (!in_array($imgExt, $this->gdlibExtensions, true)) {
                 $BBimage = $this->imageMagickConvert($conf['file'], $this->gifExtension);
             } else {
                 $BBimage = $this->getImageDimensions($conf['file']);
             }
             $maskInf = pathinfo($conf['mask']);
             $maskExt = strtolower($maskInf['extension']);
-            if (!GeneralUtility::inList($this->gdlibExtensions, $maskExt)) {
+            if (!in_array($maskExt, $this->gdlibExtensions, true)) {
                 $BBmask = $this->imageMagickConvert($conf['mask'], $this->gifExtension);
             } else {
                 $BBmask = $this->getImageDimensions($conf['mask']);
@@ -441,11 +427,9 @@ class GraphicalFunctions
                     $im = $backIm;
                 }
                 // Unlink files from process
-                if (!$this->dontUnlinkTempFiles) {
-                    unlink($theDest);
-                    unlink($theImage);
-                    unlink($theMask);
-                }
+                unlink($theDest);
+                unlink($theImage);
+                unlink($theMask);
             }
         }
     }
@@ -461,7 +445,7 @@ class GraphicalFunctions
     public function copyImageOntoImage(&$im, $conf, $workArea)
     {
         if ($conf['file']) {
-            if (!GeneralUtility::inList($this->gdlibExtensions, $conf['BBOX'][2])) {
+            if (!in_array($conf['BBOX'][2], $this->gdlibExtensions, true)) {
                 $conf['BBOX'] = $this->imageMagickConvert($conf['BBOX'][3], $this->gifExtension);
                 $conf['file'] = $conf['BBOX'][3];
             }
@@ -641,7 +625,7 @@ class GraphicalFunctions
                 $this->ImageWrite($maskImg, $fileMask);
                 imagedestroy($maskImg);
                 // Downscales the mask
-                if ($this->NO_IM_EFFECTS) {
+                if (!$this->processorEffectsEnabled) {
                     $command = trim($this->scalecmd . ' ' . $w . 'x' . $h . '! -negate');
                 } else {
                     $command = trim($conf['niceText.']['before'] . ' ' . $this->scalecmd . ' ' . $w . 'x' . $h . '! ' . $conf['niceText.']['after'] . ' -negate');
@@ -670,11 +654,9 @@ class GraphicalFunctions
                     $im = $backIm;
                 }
                 // Deleting temporary files;
-                if (!$this->dontUnlinkTempFiles) {
-                    unlink($fileMenu);
-                    unlink($fileColor);
-                    unlink($fileMask);
-                }
+                unlink($fileMenu);
+                unlink($fileColor);
+                unlink($fileMask);
             }
         }
     }
@@ -1411,7 +1393,7 @@ class GraphicalFunctions
         $workArea = $this->applyOffset($workArea, GeneralUtility::intExplode(',', $conf['offset']));
         $blurRate = MathUtility::forceIntegerInRange((int)$conf['blur'], 0, 99);
         // No effects if ImageMagick ver. 5+
-        if (!$blurRate || $this->NO_IM_EFFECTS) {
+        if (!$blurRate || !$this->processorEffectsEnabled) {
             $txtConf['fontColor'] = $conf['color'];
             $this->makeText($im, $txtConf, $workArea);
         } else {
@@ -1485,11 +1467,9 @@ class GraphicalFunctions
                 }
             }
             // Deleting temporary files;
-            if (!$this->dontUnlinkTempFiles) {
-                unlink($fileMenu);
-                unlink($fileColor);
-                unlink($fileMask);
-            }
+            unlink($fileMenu);
+            unlink($fileColor);
+            unlink($fileMask);
         }
     }
 
@@ -1597,12 +1577,12 @@ class GraphicalFunctions
                     $commands .= ' -gamma ' . (float)$value;
                     break;
                 case 'blur':
-                    if (!$this->NO_IM_EFFECTS) {
+                    if ($this->processorEffectsEnabled) {
                         $commands .= $this->v5_blur($value);
                     }
                     break;
                 case 'sharpen':
-                    if (!$this->NO_IM_EFFECTS) {
+                    if ($this->processorEffectsEnabled) {
                         $commands .= $this->v5_sharpen($value);
                     }
                     break;
@@ -1701,7 +1681,7 @@ class GraphicalFunctions
         $conf['offset'] = $cords[0] . ',' . $cords[1];
         $cords = $this->objPosition($conf, $this->workArea, [$cords[2], $cords[3]]);
         $newIm = imagecreatetruecolor($cords[2], $cords[3]);
-        $cols = $this->convertColor($conf['backColor'] ? $conf['backColor'] : $this->setup['backColor']);
+        $cols = $this->convertColor($conf['backColor'] ?: $this->setup['backColor']);
         $Bcolor = imagecolorallocate($newIm, $cols[0], $cols[1], $cols[2]);
         imagefilledrectangle($newIm, 0, 0, $cords[2], $cords[3], $Bcolor);
         $newConf = [];
@@ -1747,11 +1727,9 @@ class GraphicalFunctions
                 // Clears workArea to total image
                 $this->setWorkArea('');
             }
-            if (!$this->dontUnlinkTempFiles) {
-                unlink($theFile);
-                if ($theNewFile[3] && $theNewFile[3] != $theFile) {
-                    unlink($theNewFile[3]);
-                }
+            unlink($theFile);
+            if ($theNewFile[3] && $theNewFile[3] != $theFile) {
+                unlink($theNewFile[3]);
             }
         }
     }
@@ -2092,7 +2070,7 @@ class GraphicalFunctions
             $newExt = $info[2];
         }
         if ($newExt === 'web') {
-            if (GeneralUtility::inList($this->webImageExt, $info[2])) {
+            if (in_array($info[2], $this->webImageExt, true)) {
                 $newExt = $info[2];
             } else {
                 $newExt = $this->gif_or_jpg($info[2], $info[0], $info[1]);
@@ -2101,7 +2079,7 @@ class GraphicalFunctions
                 }
             }
         }
-        if (!GeneralUtility::inList($this->imageFileExt, $newExt)) {
+        if (!in_array($newExt, $this->imageFileExt, true)) {
             return null;
         }
 
@@ -2155,7 +2133,7 @@ class GraphicalFunctions
         }
         // Making the temporary filename:
         GeneralUtility::mkdir_deep(PATH_site . 'typo3temp/assets/images/');
-        $output = $this->absPrefix . 'typo3temp/assets/images/' . $this->filenamePrefix . $theOutputName . '.' . $newExt;
+        $output = PATH_site . 'typo3temp/assets/images/' . $this->filenamePrefix . $theOutputName . '.' . $newExt;
         if ($this->dontCheckForExistingTempFile || !file_exists($output)) {
             $this->imageMagickExec($imagefile, $output, $command, $frame);
         }
@@ -2185,7 +2163,7 @@ class GraphicalFunctions
     public function getImageDimensions($imageFile)
     {
         preg_match('/([^\\.]*)$/', $imageFile, $reg);
-        if (file_exists($imageFile) && GeneralUtility::inList($this->imageFileExt, strtolower($reg[0]))) {
+        if (file_exists($imageFile) && in_array(strtolower($reg[0]), $this->imageFileExt, true)) {
             if ($returnArr = $this->getCachedImageDimensions($imageFile)) {
                 return $returnArr;
             }
@@ -2632,9 +2610,7 @@ class GraphicalFunctions
             $this->w = imagesx($im);
             $this->h = imagesy($im);
         }
-        if (!$this->dontUnlinkTempFiles) {
-            unlink($theFile);
-        }
+        unlink($theFile);
     }
 
     /**
@@ -2737,10 +2713,9 @@ class GraphicalFunctions
         $result = false;
         switch ($ext) {
             case 'jpg':
-
             case 'jpeg':
                 if (function_exists('imagejpeg')) {
-                    if ($quality == 0) {
+                    if ($quality === 0) {
                         $quality = $this->jpegQuality;
                     }
                     $result = imagejpeg($destImg, $theImage, $quality);
@@ -2791,7 +2766,6 @@ class GraphicalFunctions
                 }
                 break;
             case 'jpg':
-
             case 'jpeg':
                 if (function_exists('imagecreatefromjpeg')) {
                     return imagecreatefromjpeg($sourceImg);
@@ -2872,13 +2846,11 @@ class GraphicalFunctions
                 }
             }
             // Unlink files from process
-            if (!$this->dontUnlinkTempFiles) {
-                if ($origName) {
-                    @unlink($origName);
-                }
-                if ($postName) {
-                    @unlink($postName);
-                }
+            if ($origName) {
+                @unlink($origName);
+            }
+            if ($postName) {
+                @unlink($postName);
             }
         }
         return $retCol;
diff --git a/typo3/sysext/core/Classes/Resource/Processing/LocalCropScaleMaskHelper.php b/typo3/sysext/core/Classes/Resource/Processing/LocalCropScaleMaskHelper.php
index 101258cf2d584625828213cf6a2e922e0ea4e8d8..cdff4495038dbbdd558e68fc762d160feb38531a 100644
--- a/typo3/sysext/core/Classes/Resource/Processing/LocalCropScaleMaskHelper.php
+++ b/typo3/sysext/core/Classes/Resource/Processing/LocalCropScaleMaskHelper.php
@@ -65,7 +65,6 @@ class LocalCropScaleMaskHelper
         /** @var $gifBuilder GifBuilder */
         $gifBuilder = GeneralUtility::makeInstance(GifBuilder::class);
         $gifBuilder->init();
-        $gifBuilder->absPrefix = PATH_site;
 
         $configuration = $targetFile->getProcessingConfiguration();
         $configuration['additionalParameters'] = $this->modifyImageMagickStripProfileParameters($configuration['additionalParameters'], $configuration);
diff --git a/typo3/sysext/core/Classes/Resource/Processing/LocalPreviewHelper.php b/typo3/sysext/core/Classes/Resource/Processing/LocalPreviewHelper.php
index 999a92bf32f61e78b1c207ccc8d7c7ad70ef4dc5..a90d7535f88a636809f8441a85a961797c67d409 100644
--- a/typo3/sysext/core/Classes/Resource/Processing/LocalPreviewHelper.php
+++ b/typo3/sysext/core/Classes/Resource/Processing/LocalPreviewHelper.php
@@ -119,7 +119,6 @@ class LocalPreviewHelper
             /** @var $gifBuilder \TYPO3\CMS\Frontend\Imaging\GifBuilder */
             $gifBuilder = GeneralUtility::makeInstance(\TYPO3\CMS\Frontend\Imaging\GifBuilder::class);
             $gifBuilder->init();
-            $gifBuilder->absPrefix = PATH_site;
             $info = $gifBuilder->getImageDimensions($originalFileName);
             $newInfo = $gifBuilder->getImageScale($info, $configuration['width'], $configuration['height'], []);
             $result = [
diff --git a/typo3/sysext/core/Configuration/DefaultConfiguration.php b/typo3/sysext/core/Configuration/DefaultConfiguration.php
index e889afebc7bcb7b60d538e9d0fcb445580785a79..7bb1f4c0346ca9906d0d5e1d9f79d62eaea0cc8a 100644
--- a/typo3/sysext/core/Configuration/DefaultConfiguration.php
+++ b/typo3/sysext/core/Configuration/DefaultConfiguration.php
@@ -30,7 +30,7 @@ return [
         'processor_path' => '/usr/bin/',
         'processor_path_lzw' => '/usr/bin/',
         'processor' => 'ImageMagick',
-        'processor_effects' => 0,
+        'processor_effects' => false,
         'processor_allowUpscaling' => true,
         'processor_allowFrameSelection' => true,
         'processor_allowTemporaryMasksAsPng' => false,
diff --git a/typo3/sysext/core/Configuration/DefaultConfigurationDescription.yaml b/typo3/sysext/core/Configuration/DefaultConfigurationDescription.yaml
index d1b449b09a99db28c7ebe0640a4daef4c09a3789..be6523c67fe69e4833d20ce9943b73ecf0ba3191 100644
--- a/typo3/sysext/core/Configuration/DefaultConfigurationDescription.yaml
+++ b/typo3/sysext/core/Configuration/DefaultConfigurationDescription.yaml
@@ -35,12 +35,8 @@ GFX:
               'GraphicsMagick': 'Choose GraphicsMagick for processing images'
             description: 'Select which external software on the server should process images - see also the Preset functionality to see what is available.'
         processor_effects:
-            type: int
-            allowedValues:
-              '-1': 'Do not sharpen images by default'
-              '0': 'Disable all effects from ImageMagick/GraphicsMagick'
-              '1': 'All; blur and sharpening is allowed in ImageMagick'
-            description: 'Apply special ImageMagick functionality when processing images'
+            type: bool
+            description: 'If enabled, apply blur and sharpening in ImageMagick/GraphicMagick functions'
         processor_allowUpscaling:
             type: bool
             description: 'If set, images can be scaled up if told so (in <code>\TYPO3\CMS\Core\Imaging\GraphicalFunctions</code>)'
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Breaking-82768-ConfigurationOptionsForImageManipulationPHPAPI.rst b/typo3/sysext/core/Documentation/Changelog/master/Breaking-82768-ConfigurationOptionsForImageManipulationPHPAPI.rst
new file mode 100644
index 0000000000000000000000000000000000000000..5595eac3a375bf53f3a3422b36453aebde1b2148
--- /dev/null
+++ b/typo3/sysext/core/Documentation/Changelog/master/Breaking-82768-ConfigurationOptionsForImageManipulationPHPAPI.rst
@@ -0,0 +1,63 @@
+.. include:: ../../Includes.txt
+
+=======================================================================
+Breaking: #82768 - Configuration Options for Image Manipulation PHP API
+=======================================================================
+
+See :issue:`82768`
+
+Description
+===========
+
+The main PHP class `GraphicalFunctions` for rendering images based on ImageMagick/GraphicsMagick
+and/or GDlib has been cleaned up in order to optimize various places within the code itself,
+making more use of the proper "init()" function setting all relevant options.
+
+The following previously public properties are therefore either set to "protected"
+or removed/renamed as part of the streaming process, removing the possibility to
+override any of the settings other than via the `init()` method within
+GraphicalFunctions:
+
+ * GraphicalFunctions->gdlibExtensions
+ * GraphicalFunctions->imageFileExt
+ * GraphicalFunctions->webImageExt
+ * GraphicalFunctions->NO_IM_EFFECTS
+ * GraphicalFunctions->NO_IMAGE_MAGICK
+ * GraphicalFunctions->mayScaleUp
+ * GraphicalFunctions->dontCompress
+ * GraphicalFunctions->dontUnlinkTempFiles
+ * GraphicalFunctions->absPrefix
+ * GraphicalFunctions->im5fx_blurSteps
+ * GraphicalFunctions->im5fx_sharpenSteps
+ * GraphicalFunctions->pixelLimitGif
+ * GraphicalFunctions->colMap
+ * GraphicalFunctions->csConvObj
+ * GraphicalFunctions->jpegQuality
+ * GraphicalFunctions->OFFSET
+
+Additionally, the option to disable the deletion of tempFiles have been removed.
+
+The global configuration option :php:`$TYPO3_CONF_VARS[GFX][processor_effects]`
+is a boolean option now.
+
+
+Impact
+======
+
+Setting any of the PHP properties above will have no effect anymore.
+
+
+Affected Installations
+======================
+
+Any TYPO3 installation with a extension accessing directly GraphicalFunctions or GifBuilder API
+via PHP and using any of the properties above.
+
+
+Migration
+=========
+
+Ensure all options are properly set when calling :php:`GraphicalFunctions->init()` and remove
+all calls to get or set values from the previously public properties.
+
+.. index:: LocalConfiguration, PHP-API, NotScanned
\ No newline at end of file
diff --git a/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php b/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
index abd3cb3de21db254591e9a96ad39d906f661c5f0..9991ab3850c50ac3d64fb4a4f74ba552819fd5fe 100644
--- a/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
+++ b/typo3/sysext/frontend/Classes/Imaging/GifBuilder.php
@@ -663,7 +663,7 @@ class GifBuilder extends GraphicalFunctions
      */
     public function getResource($file, $fileArray)
     {
-        if (!GeneralUtility::inList($this->imageFileExt, $fileArray['ext'])) {
+        if (!in_array($fileArray['ext'], $this->imageFileExt, true)) {
             $fileArray['ext'] = $this->gifExtension;
         }
         /** @var ContentObjectRenderer $cObj */
diff --git a/typo3/sysext/install/Classes/Controller/EnvironmentController.php b/typo3/sysext/install/Classes/Controller/EnvironmentController.php
index 9582c61cceb617965150500283a2c8eef15001bf..e34b3c65bcff43fdce86aaa496b17a016ce44d59 100644
--- a/typo3/sysext/install/Classes/Controller/EnvironmentController.php
+++ b/typo3/sysext/install/Classes/Controller/EnvironmentController.php
@@ -717,7 +717,7 @@ class EnvironmentController extends AbstractController
         $conf['niceText'] = 1;
         $conf['shadow.'] = [
             'offset' => '2,2',
-            'blur' => $imageProcessor->NO_IM_EFFECTS ? '90' : '20',
+            'blur' => '20',
             'opacity' => '50',
             'color' => 'black'
         ];
@@ -745,10 +745,9 @@ class EnvironmentController extends AbstractController
     {
         $imageProcessor = GeneralUtility::makeInstance(GraphicalFunctions::class);
         $imageProcessor->init();
-        $imageProcessor->absPrefix = PATH_site;
-        $imageProcessor->dontCheckForExistingTempFile = 1;
+        $imageProcessor->dontCheckForExistingTempFile = true;
         $imageProcessor->filenamePrefix = 'installTool-';
-        $imageProcessor->dontCompress = 1;
+        $imageProcessor->dontCompress = true;
         $imageProcessor->alternativeOutputKey = 'typo3InstallTest';
         return $imageProcessor;
     }
@@ -971,7 +970,7 @@ class EnvironmentController extends AbstractController
      */
     protected function getImagesPath(GraphicalFunctions $imageProcessor): string
     {
-        $imagePath = $imageProcessor->absPrefix . 'typo3temp/assets/images/';
+        $imagePath = PATH_site . 'typo3temp/assets/images/';
         if (!is_dir($imagePath)) {
             GeneralUtility::mkdir_deep($imagePath);
         }