IBM Visualization Data Explorer Programmer's Reference

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DXOutputRGB

Function

Writes an image to a file in RGB format.

Syntax

#include <dx/dx.h>

Field DXOutputRGB(Field i, int fd)

Functional Details The routine writes image Field i to file descriptor fd as three bytes (red, green, and blue) per pixel.

The values of the floating-point "colors" component (ranging from 0.0 to 1.0) are converted into byte values from 0 to 255. Values below 0 and above 1 are changed to 0 and 255 respectively.

The image is written at the current byte offset in the file. lseek() should be called first to reposition the current read/write pointer to the desired location.

Return Value Returns i or returns NULL and sets an error code.

See Also

16.9 , "Image Fields".


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