Simulate four to six bits?

M
Posted By
m
Jun 10, 2008
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774
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I need to take an 8 bit image and simulate what it would look like as a four or six bit image.

Any suggestions on how to do this?

Thanks,

-Martin
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A
a
Jun 11, 2008
File>Save for Web>GIF> No dither> set number of colors to 16 or 64.

"m" wrote in message
I need to take an 8 bit image and simulate what it would look like as a four or six bit image.

Any suggestions on how to do this?

Thanks,

-Martin
M
m
Jun 11, 2008
File>Save for Web>GIF> No dither> set number of colors to 16 or 64.

Thanks.

-Martin
TK
Toobi-Won Kenobi
Jun 11, 2008
"CraigM" wrote in message
File>Save for Web>GIF> No dither> set number of colors to 16 or 64.

Is this what the OP means?
I read it as 4 and 6 bits per channel, not 16 (4 bit) or 64 (6 bit) colours. 4 bits per channel in RGB would be 4,096 colours.
6 bits per channel in RGB would be 262,144 colours.
TWK

"m" wrote in message
I need to take an 8 bit image and simulate what it would look like as a four or six bit image.

Any suggestions on how to do this?

Thanks,

-Martin

G
Greg
Jun 11, 2008
m wrote:
I need to take an 8 bit image and simulate what it would look like as a four or six bit image.

Any suggestions on how to do this?

Thanks,

-Martin

In Photoshop, Image/Adjustments/Posterize, and set the level to 16 for a 4-bit image (2^4=16), and 64 for a 6-bit image (2^6=64).

An 8-bit image has 2^8=256 levels of brightness per color channel, from 0 to 255. Posterizing will reduce the number of brightness levels to your chosen bit count.

Colin D.

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