ImageGear for C and C++ on Windows v20.0 - Updated
IG_ISIS_TAG_SAMPLESPERPIXEL
API Reference Guide > ISIS Component API Reference > ISIS Component Tags Reference > Scanning Mode Tags > IG_ISIS_TAG_SAMPLESPERPIXEL

Number of components per pixel. 0x0115  277

IG_ISIS_TAG_SAMPLESPERPIXEL contains the number of values each pixel uses to represent its data.

Type:

IG_ISIS_TAG_TYPE_SHORT

Drivers:

All source and destination drivers.

Values:

Value Meaning
1 One sample per pixel. Binary, grayscale, and palette color images use this value.
3 Three samples per pixel. RGB color images use this value. Each pixel has three samples: one for red, one for green, and one for blue, regardless of how many bits are used to represent each sample.

The default value is 1.

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_BITSPERSAMPLE

IG_ISIS_TAG_PHOTOMETRICINTERPRETATION

IG_ISIS_TAG_PLANARCONFIGURATION

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