Search found 2 matches

by Qs8Y27ozL6xXk6SYoC2m
2015-01-23T16:39:00-07:00
Forum: Magick++
Topic: Different Quantum levels after writing/reading image
Replies: 3
Views: 6753

Re: Different Quantum levels after writing/reading image

I'm not quite sure what you are asking, but the following might answer it. When Q16 (or Q32 or Q64) IM reads an 8-bit/channel/pixel image, values are expanded to fit the Q. Ths is NOT done by simply shifting bits, because we want 0->0 and 255->65535. It is done by replicating bytes, so an input 8-b...
by Qs8Y27ozL6xXk6SYoC2m
2015-01-23T15:04:18-07:00
Forum: Magick++
Topic: Different Quantum levels after writing/reading image
Replies: 3
Views: 6753

Different Quantum levels after writing/reading image

I'm using a pixel cache to modify PixelPacket struct for each pixel in a Bitmap which is synced before writing. The image I'm editing has a color depth of 8 and my version of Magick++ is using a MagicQuantumDepth of 16. I open the image and in the first 10 pixels I modify the RGB color values. It fi...