[Tig] Re: HDR format

Jim Houston jim.houston
Mon Apr 3 00:28:08 BST 2006


--
Thanks to oktobor for supporting the TIG
--
On my CRT, this images shows up with about 15-20 steps
in different areas (some are debatable).

When many colors and luminances are considered,  a step of 0.25%
is sometimes considered the threshold of detectability.


On Apr 1, 2006, at 9:00 AM, Bob Friesenhahn wrote:

> --
> Thanks to oktobor for supporting the TIG
> --
>> I have attached an 8-bit (0.5% steps with gamma 2.2) PNG image 
>> containing some gradients.  Perhaps others can
>> test view this image using their own software and display equipment 
>> and report if they see any obvious
>> stairstepping?  I do not see any obvious stairstepping when viewed on 
>> my own LCD display.
>
> It seems that the list processor stripped off my 900 byte image.  The 
> gradient image is available from 
> "http://www.simplesystems.org/users/bfriesen/gradients.png".
>
> Even when viewing this file using Mozilla, I do not see stairstepping 
> with this file on my LCD display.
>
> Bob
> ======================================
> Bob Friesenhahn
> bfriesen at simple.dallas.tx.us, 
> http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>
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> Tig list - http://tig.oktobor.com/mailman/listinfo/tig
> TIG wiki: http://tig.colorist.org/wiki
>


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