Convert 16 bpp image to 8 bpp greyscale in c++

Asked Apr 30 '20 at 18:58

Active Apr 30 '20 at 19:02

Viewed 115 times

I have image source that generates images in 16 bpp. I have this info in unsigned char * buffer. I need to display image, which I cant using Labwindows directly in 16-bit. It doesnt support 16 bit. How to convert 16bpp in 8 bpp to show it Labwindows using NEWBITMAP();

I am a new to this conversion. Please help me write conversion in c++

edited Apr 30 '20 at 19:02

JohnFilleau

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asked Apr 30 '20 at 18:58

user9559196

Iterate over your character buffer and copy the most significant byte of each pixel into a new buffer that's half the size. – JohnFilleau Apr 30 '20 at 19:04
@JohnFilleau that's the naive way to do it. It would be better to make a pass over the image to get the min/max then scale it. It would be even better to use dithering to get more levels out of those 8 bits. – Mark Ransom Apr 30 '20 at 19:06
@Mark better is subjective, but good suggestions. – JohnFilleau Apr 30 '20 at 19:09
@Mark Ransom: looks better. Can you give an example in c++. I am new to this field, sorry – user9559196 Apr 30 '20 at 19:40
Sorry, I'm not at all familiar with Labwindows. Otherwise I would have left an answer. – Mark Ransom May 01 '20 at 00:54

Convert 16 bpp image to 8 bpp greyscale in c++

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