ImageGear for C and C++ on Linux v20.0 - Updated
Format Bit Depths
User Guide > File Formats and Compressions > File Formats > Format Bit Depths

You may want to convert a file from one format to another. You can do this by saving the original file to its desired format by setting the nFormatType parameter to the appropriate value in the saving function. For more information on converting issues, see the sections Loading Images and Saving Images.

When saving a file to another format, remember to ensure that the desired file format is supported for that image. For example, you cannot convert an 8-bit DCX file to an 8-bit CAL file, because the CAL format does not support 8-bit files.

In the following table, the columns underneath the numbers indicated size in bits that can actually be saved (written). In each cell, a value of "R" indicates read-only support, and a value of "RW" indicates that the ImageGear reads and writes the corresponding file format.

Format 1 4 8 9-16 24 32 36 48 64 Notes
Adobe DNG R R
Adobe PDF RW RW RW RW RW
Adobe PSB RW RW RW RW RW R R
Adobe PSD RW RW RW RW RW R R
AFX R
AVI R R R R
BMP RW RW RW RW RW R
BTR RW
CAL RW
CLP RW RW RW RW
CUR RW RW RW RW Supports Extra ((1, 3, 4, 8)*2)-bit images also.
CUT RW
DCRAW R R
DCX RW RW RW RW
DICOM RW RW RW RW RW RW
EPS RW RW RW RW Screen Preview image only when reading.
EXIF-JPEG RW RW RW RW RW
EXIF-TIFF RW RW RW RW RW RW RW RW RW
GEM R R R
GIF RW RW RW
Group 3 RW
Group 3 2D RW
Group 4 RW
Headerless Digital Camera RAW R R
HEIF R R 8-bit grayscale and 24-bit RGB
IBM AFP R R R RW
IBM IOCA RW R R R
IBM MO:DCA RW R R R
ICO RW RW RW RW
IFF RW RW RW RW
IMG R R
IMR R
IMT RW
JPEG RW RW RW RW RW RW 8-bit grayscale.
JPEG 2000 RW RW RW RW RW RW RW RW RW
JPX RW RW RW RW RW RW RW RW RW
KFX R
LV R
MAC R
MAC PICT RW RW RW RW RW
MSP R
NCR RW R
PBM RW RW RW RW RW
PCD R
PCX RW RW RW RW
PGM RW RW Supports 16-bit grayscale images also.
PNG RW RW RW RW RW RW RW RW Supports 48(RGB) and 64(RGB+alpha) bit images.
PNM RW RW RW RW RW Supports 16-bit grayscale and 48-bit color images also.
PPM RW RW
QuickTime R
RAS RW R RW RW
RAW R R R R R R
Scitex CT RW The native format is CMYK. With full CMYK support enabled, you can use 32-bit images.
SGI RW RW RW RW
TGA RW RW RW RW RW
TIFF RW RW RW RW RW RW RW RW RW Read only supports also 3 and 6 bpp for RGB and LAB color spaces for Deflate, LZW (Lempel-Ziv-Welch), Packbits compressions and uncompressed.
TXT (ASCII Text) Read-only support. Converts to raster image when loaded.
WBMP RW
WMF RW RW RW RW
WPG R R R
XBM RW
XPM RW RW RW R
XWD RW RW RW RW
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