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

Color space of image data. 0x0106  262

IG_ISIS_TAG_PHOTOMETRICINTERPRETATION allows you to specify or determine the color arrangement of the image data. The PixTools Toolkit used to recommend using this tag to invert binary images; however we now strongly recommend that you use IG_ISIS_TAG_INVERT instead, because it properly inverts grayscale and color images as well.

Type:

IG_ISIS_TAG_TYPE_SHORT

Drivers:

All scanner drivers.

Values:

Value Defined Constant Meaning
0 IG_ISIS_PHOTOMETRIC_WHITE0 0 is imaged as white, 1 is imaged as black.
1 IG_ISIS_PHOTOMETRIC_WHITE1 0 is imaged as black, 1 is imaged as white.
2 IG_ISIS_PHOTOMETRIC_RGB RGB image
3 IG_ISIS_PHOTOMETRIC_PALETTE Palette color image
120 IG_ISIS_PHOTOMETRIC_BGR Same as RGB, but blue and red planes are reversed.

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_BITSPERSAMPLE

IG_ISIS_TAG_PLANARCONFIGURATION

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