Re: [Gimp-developer] 10-bit display color depth support (30-bit, deep color)

[Magnus Larsson <k magnus larsson bahnhof se>]

On 12/5/21 11:37 PM, Liam R E Quin wrote:
> On Sun, 2021-12-05 at 23:04 +0100, Magnus Larsson wrote:
> > click. If I then click, as you say on GIMP image, I then get
> > "Depth: 30" in terminal
> ok, so gimp is indeed using 10 bit display.
>
> If you make a new image in 32-bit floating point, 1024 pixels wide, and
> make a gradient across the window, is there visible banding?
>
> What format are your test images in?
>
> slave liam
The test files from EIZO are:

 * TIFF: 8 bit non-linear integer for the 8 bit gradient 1600 x 1200 
pixels and
 * TIFF: 16 bit non linear integer for the 16 bit gradient 1600 x 1200 
pixels .

I use these test images
https://www.eizo-apac.com/support-service/tech-library/monitor-test
16_bit_gradient TIFF: 
https://www.eizo-apac.com/static/uploads/files/16bitgradation-wfuncyaztzod.tif 

8_bit_gradient TIFF: 
https://www.eizo-apac.com/static/uploads/files/8bitgradation-wfqfukzeuago.tif

I prefer to use the test files from the links, as requested and 
recommended by my monitor supplier EIZO.

Why is it so critical to have 32-bit floating point, 1024 pixels wide?