Color spaces

8-bit grayscale image

HPDF_CS_DEVICE_GRAY

Grayscale describes each pixel with one byte. For each byte, 0x00 is maximum dark, 0xFF maximum light.

Image data size is width * height bytes.

The sequence of bytes for an 8-pixel 8-bit image with 2 rows and 4 columns would be:

1   2   3   4
5   6   7   8

24-bit RGB color image

HPDF_CS_DEVICE_RGB

The 24-bit RGB color image describes each pixel with three bytes (Red, Green, Blue). For each byte, 0x00 is maximum dark, 0xFF maximum light.

Image data size is width * height * 3 bytes.

The sequence of bytes for an 8-pixel 24-bit image with 2 rows and 4 columns would be:

1R 1G 1B  2R 2G 2B  3R 3G 3B  4R 4G 4B
5R 5G 5B  6R 6G 6B  7R 7G 7B  8R 8G 8B

32-bit CMYK color image

HPDF_CS_DEVICE_CMYK

The 32-bit CMYK color image describes each pixel with four bytes (Cyan, Magenta, Yellow, Black). For each byte, 0x00 is maximum dark, 0xFF maximum light.

Image data size is width * height * 4 bytes.

The sequence of bytes for an 8-pixel 32-bit image with 2 rows and 4 columns would be:

1C 1M 1Y 1K  2C 2M 2Y 2K  3C 3M 3Y 3K  4C 4M 4Y 4K
5C 5M 5Y 5K  6C 6M 6Y 6K  7C 7M 7Y 7K  8C 8M 8Y 8K