| Format |
Read |
Write |
Notes |
References |
| BMP |
yes |
yes |
Mostly Complete. May not read some cursors, icons and OS/2 bitmaps.
Controlling the exact format when writing is incomplete.
|
No spec, see:
wikipedia
|
| GIF |
yes |
yes |
Both versions 87a and 89a Reading of animated GIFs is supported to the extent that
you can read all of the images contained in a GIF, but timing/loop info is ignored.
Controlling the exact format when writing is incomplete.
|
spec
wikipedia
|
| JPEG/JFIF |
some |
no |
Reads only simple grayscale and YCbCr baseline sequential JPEG images without RST markers,
which must use 8 bits per component and be Huffman encoded.
Can read image info, metadata and extract ICC Profiles. Both JFIF and DCF/EXIF.
Provides JPEG comments in ImageInfo.
|
JFIF spec
JPEG Group
wikipedia
|
| ICNS |
mostly |
mostly |
Missing support for JPEG2000 icons, but all other formats and sizes are correctly read and written.
Extensively tested for correctness against MacOS X, including behavior with missing masks.
|
wikipedia
|
| ICO/CUR |
yes |
mostly |
Reads 1/4/8/16/24/32 bpp .ico and .cur files. Supports the new Windows Vista ICO files with embedded PNGs.
Deals correctly with alpha vs bitmask transparency issues in 32 bpp. Supports bitfield compressed bitmaps.
Extensively tested. Probably the best open-source implementation under the sun.
|
No spec, see:
wikipedia
|
| PCX/DCX |
yes |
yes |
Reads 1 plane 1/2/4/8 bit, 1 bit 1/2/3/4 plane, 3 plane 8 bit, 1 plane 24 bit, and 1 plane 32 bit images.
Monochrome is parsed correctly. Reads and can write the undocumented uncompressed PCX format.
Reading short DCX tables is supported. Thoroughly tested.
|
|
| PNM/PGM/PBM/PPM/PAM Portable Pixmap |
yes |
mostly |
Reading complete. PAM writing only in RGB_ALPHA format.
|
spec
wikipedia
|
| PNG |
yes |
yes |
Supported through version 1.2/ISO/IEC standard (15948:2003).
Controlling the exact format when writing is incomplete.
|
spec
wikipedia
|
| PSD/Photoshop |
yes |
no |
Basic support. Can only read the first Layer. No support for extra channels.
Supports all modes except Multichannel. Can read some image metadata.
|
Unofficial spec
spec
wikipedia
|
| RGBE/Radiance HDR |
yes |
no |
Basic support.
|
Wikipedia
|
| TIFF |
yes |
yes |
Supported through version 6.0. TIFFs is a open-ended container format, so it's not
possible to support every possibly variation.
Supports Bi-Level, Palette/Indexed, RGB, CMYK, YCbCr, CIELab and LOGLUV images.
Supports reading and writing LZW, CCITT Modified Huffman/Group 3/Group 4,
and Packbits/RLE compression. Notably missing other forms of compression though,
including JPEG. Supports reading Tiled images.
|
Adobe
spec
wikipedia
AWare Systems TIFF Tag Reference
|
| WBMP |
yes |
yes |
Complete support for WBMP type 0 bitmaps.
|
wikipedia
spec
|
| XBM |
yes |
yes |
Complete.
|
wikipedia
spec
|
| XPM |
yes |
yes |
Only XPM version 3 is currently supported, but the other versions are obsolete.
Reads all color formats, including those using symbolic names from rgb.txt.
Writing only writes color data.
|
wikipedia
spec
|
