[GFX][image_processing] = 1
Boolean: Enables image processing features. Disabling this means NO image processing with either GD or IM!
[GFX][thumbnails] = 1
Boolean: Enables the use of thumbnails in the backend interface. Thumbnails are generated by IM/partly GD in the file typo3/thumbs.php
[GFX][thumbnails_png]
Bits. Bit0: If set, thumbnails from non-jpegs will be 'png', otherwise 'gif' (0=gif/1=png). Bit1: Even JPG's will be converted to png or gif (2=gif/3=png)
[GFX][gif_compress] = 1
Boolean: Enables the use of the \TYPO3\CMS\Core\Utility\GeneralUtility::gif_compress() workaround function for compressing giffiles made with GD or IM, which probably use only RLE or no compression at all.
[GFX][imagefile_ext] = gif,jpg,jpeg,tif,tiff,bmp,pcx,tga,png,pd
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!
[GFX][gdlib] = 1
Boolean: Enables the use of GD.
[GFX][gdlib_png] = 0
Boolean: Enables the use of GD, with PNG only. This means that all items normally generated as gif-files will be png-files instead!
[GFX][im] = 1
Boolean: Enables the use of IM.
[GFX][im_path] = /usr/bin/
Path to the IM tools 'convert', 'combine', 'identify'.
[GFX][im_path_lzw] = /usr/bin/
Path to the IM tool 'convert' with LZW enabled! See 'gif_compress'. If your version 4.2.9 of ImageMagick is compiled with LZW you may leave this field blank AND disable the flag 'gif_compress'! Tip: You can call LZW 'convert' with a prefix like 'myver_convert' by setting this path with it, eg. '/usr/bin/myver_' instead of just '/usr/bin/'.
[GFX][im_version_5] = gm
String: Set this either to "im6" or "gm" (uses GraphicsMagick instead of ImageMagick). Setting this value will automatically configure some settings for use with the specified program version.
[GFX][im_v5effects] = -1
Integer (-1, 0, 1)
0disabled-1Do not sharpen images by default1All; blur and sharpening is allowed in ImageMagick.
[GFX][im_mask_temp_ext_gif] = 1
Boolean: This should be set if ImageMagick is version 5+. This is used in \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer for masking images and the extension png is normally used because it's faster than gif for temporary files. But png seems not to work with some IM 5+ versions, so...
[GFX][im_noScaleUp] = 0
Boolean: If set, images are not being scaled up if told so (in t3lib/stdgraphics.php)
[GFX][im_noFramePrepended] = 0
Boolean: If set, the [x] frame indicator is NOT prepended to filenames in stdgraphic. Some IM5+ version didn't work at all with the typical [0]-prefix, which allow multipage pdf's and animated gif's to be scaled only for the first frame/page and that seriously cuts down rendering time. Set this flag only if your ImageMagick version cannot find the files. Notice that changing this flag causes temporary filenames to change, thus the server will begin scaling images again which were previously cached.
[GFX][im_stripProfileCommand] = +profile '*'
String: Specify the command to strip the profile information, which can reduce thumbnail size up to 60KB. Command can differ in IM/GM, IM also know the -strip command. See imagemagick.org for details
[GFX][im_useStripProfileByDefault] = 1
Boolean: If set, the im_stripProfileCommand is used with all IM Image operations by default. See tsRef for setting this parameter explocit for IMAGE generation.
[GFX][jpg_quality] = 70
Integer: Default JPEG generation quality
[GFX][enable_typo3temp_db_tracking] = 0
Boolean: If set, then all files in typo3temp will be logged in a database table. In addition to being a log of the files with original filenames, it also serves to secure that the same image is not rendered simultaneously by two different processes.
[GFX][TTFdpi] = 96
Integer: Enter how many dpi the FreeType module uses. Freetype1 should be set to 72. Freetype2 should be set to 96 (otherwise fonts are rendered way bigger than FreeType1). This works as a global scaling factor for Freetype.
[GFX][png_truecolor] = 1
[GFX][colorspace] = RGB
String: Specifiy the colorspace to use. Some ImageMagick versions (like 6.7.0 and above) use the sRGB colorspace, so all images are darker then the original.
Possible Values: CMY, CMYK, Gray, HCL, HSB, HSL, HWB, Lab, LCH, LMS, Log, Luv, OHTA, Rec601Luma, Rec601YCbCr, Rec709Luma, Rec709YCbCr, RGB, sRGB, Transparent, XYZ, YCbCr, YCC, YIQ, YCbCr, YUV