4 bit? How

[halo]

have you tried index colour mode...dont know if it works but it will enable you to drop your bit depth below 8

[jeremybirn]

Instead of bits, indexed color mode asks for a number of Colors (4 bits = 16 colors), set Colors to 16 and you'll have 4 bit color.

-jeremy

Ok ive searched, couldnt find anything, maybe its something im doing wrong..
I have a 24 bit bitmap, i converted it to 8 bit...But its needs to be converted to 4 bit..
When i save to BMP, the option to 4 bit is greyed out...And i cant find any other option to change it to 4 bit..

Any idea? ;)
Thanks..

RIchard

[Whipyo]

If you want to use the BMP format, you can only save as 4-bit if the image is greyscale.

With 4-bits you can have 16 colours so theoretically if you save in LAB mode with 16 colours, you will have a 4-Bit image. The only problem here is that you can't save BMP files in LAB mode.

16-Bit is the lowest you can save as RGB BMP.

What seems wierd to me is that if you can save a single channel as 4-bit then why can't you save RGB (3 channels x 4-bit) as 12-bit and not 16-bit.

[iceblademush]

Hi, thanks for the help so far, but im still stuck..
What i mean to ask , is how do i go about step by step to save a 4bit image, from a 24 bit or 8 bit image.

Thanks very much!

[Cocefi]

Image > Mode > Indexed Color...
Palette: Local (Perceptual, Selective or Adaptive)
Colors: 16 maximum if Forced is set to Black and White, 15 maximum if Forced is set to None

Click OK and save file. 4-bit option should now be available.

[iceblademush]

Thank you very much for your reply! ;)
and of course to the rest for your help

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