HP b2600 Reference Manual page 436

T
glTexImage1D
Each element is a single red component. The GL converts it to floating point and
assembles it into an RGBA element by attaching 0 for green and blue, and 1 for alpha.
Each component is then multiplied by the signed scale factor GL_c_SCALE, added to the
signed bias GL_c_BIAS, and clamped to the range [0, 1] (see glPixelTransfer).
GL_GREEN
Each element is a single green component. The GL converts it to floating point and
assembles it into an RGBA element by attaching 0 for red and blue, and 1 for alpha.
Each component is then multiplied by the signed scale factor GL_c_SCALE, added to the
signed bias GL_c_BIAS, and clamped to the range [0, 1] (see glPixelTransfer).
GL_BLUE
Each element is a single blue component. The GL converts it to floating point and
assembles it into an RGBA element by attaching 0 for red and green, and 1 for alpha.
Each component is then multiplied by the signed scale factor GL_c_SCALE, added to the
signed bias GL_c_BIAS, and clamped to the range [0, 1] (see glPixelTransfer).
GL_ALPHA
Each element is a single alpha component. The GL converts it to floating point and
assembles it into an RGBA element by attaching 0 for red, green, and blue. Each
component is then multiplied by the signed scale factor GL_c_SCALE, added to the
signed bias GL_c_BIAS, and clamped to the range [0, 1] (see glPixelTransfer).
GL_RGB
Each element is an RGB triple. The GL converts it to floating point and assembles it into
an RGBA element by attaching 1 for alpha. Each component is then multiplied by the
signed scale factor GL_c_SCALE, added to the signed bias GL_c_BIAS, and clamped to
the range [0, 1] (see glPixelTransfer).
GL_RGBA
Each element contains all four components. Each component is then multiplied by the
signed scale factor GL_c_SCALE, added to the signed bias GL_c_BIAS, and clamped to
the range [0, 1] (see glPixelTransfer).
GL_LUMINANCE
Each element is a single luminance value. The GL converts it to floating point, then
assembles it into an RGBA element by replicating the luminance value three times for
red, green, and blue and attaching 1 for alpha. Each component is then multiplied by the
signed scale factor GL_c_SCALE, added to the signed bias GL_c_BIAS, and clamped to
the range [0, 1] (see glPixelTransfer).
GL_LUMINANCE_ALPHA
Each element is a luminance/alpha pair. The GL converts it to floating point, then
assembles it into an RGBA element by replicating the luminance value three times for
red, green, and blue. Each component is then multiplied by the signed scale factor
GL_c_SCALE, added to the signed bias GL_c_BIAS, and clamped to the range [0, 1] (see
glPixelTransfer).
GL_DEPTH_COMPONENT
Each element is a single depth component. It is converted to floating-point, then
multiplied by the signed scale factor GL_DEPTH_SCALE, added to the signed bias
GL_DEPTH_BIAS, and clamped to the range [0, 1] (see glPixelTransfer).
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Chapter 18