Number of bits per component. 0x0102 ∙ 258

IG_ISIS_TAG_BITSPERSAMPLE allows you to specify or determine the number of bits in each sample. (A sample is one color plane of an image, so a binary or grayscale image has one sample, while a color image has three or four samples, depending on the color model (RGB, HSB, or CMYK) being used.)

Type:

IG_ISIS_TAG_TYPE_SHORT

Drivers:

All source and destination drivers.

Values:

Value	Meaning
1	One bit per sample.
4	Four bits per sample.
8	Eight bits per sample.

Tag Dependencies and Dependent Tags:

The following tags together define the color format of the image data:

IG_ISIS_TAG_SAMPLESPERPIXEL ∙ IG_ISIS_TAG_BITSPERSAMPLE ∙ IG_ISIS_TAG_PHOTOMETRICINTERPRETATION ∙ IG_ISIS_TAG_COMPRESSION ∙ IG_ISIS_TAG_PLANARCONFIGURATION

These tags relate to color format as shown in the following table:

Samples PerPixel	BitsPerSample	Photometric Interpretation	Image Type
1	1	WHITE0 or WHITE1	Binary (black/white)
1	4	WHITE0 typical WHITE1 possible	16-level gray
8		256-level gray
1	4	PALETTE	16-color palette
8		256-color palette
3	1	RGB	3-bit color
8		24-bit color

See Also

IG_ISIS_TAG_SAMPLESPERPIXEL

IG_ISIS_TAG_PHOTOMETRICINTERPRETATION

IG_ISIS_TAG_PLANARCONFIGURATION