How do I convert a 8 bit greyscale to 36 bit

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to convert 8-bit grayscale images into 36-bits per pixel in RGB. How can you perform the conversion and make sure the new RGB images are visually identical to the original grayscale images?

What I have tried:

well i was thinking of multiplying the 3-3-2 channel in 8 bit image by 4-4-6 respectively. but i am not sure if the if i am going in a correct direction

Posted 1-May-20 3:19am

Jishnu Panja

Updated 1-May-20 3:31am

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phil.o · Answer 1 · 2020-05-01T03:32:00

Solution 1

A 8-bits "colour" has 256 possible values, from 0 to 255, to represent a grayscale.
A 36-bits colour has 12 bits per channel, assuming no transparency.
You can map the 8-bits value to its 12-bits equivalent, and assign this 12-bits values to all channels:

C#

// This is pseudocode
int channelValue = grayscaleValue << 4; // This means channelValue = grayScaleValue * 16
the36bitsColour = new Colour(channelValue, channelValue, channelValue);

Posted 1-May-20 3:32am

phil.o

Comments

OriginalGriff 1-May-20 12:36pm

Do you think he realises that his image will still be monochrome? :D

phil.o 1-May-20 13:01pm

I've been wondering, just waiting for some basic feedback to spot the obvious, if needed :)