ATI V5250 drivers, gradient dither etc

[Matteo]

Suppose probably anyone has already solve following issues:

- new driver not from Lenovo (probably ATI X1700 driver is acceptable)

- dither gradients on TFT panel (seems like with Omega driver I've had better results on my old R51 1829-9MG with FlexView panel)

- contrast/saturation adjustments of FlexView panel. As for myself IBm T60p 2007-FVG has too saturated colors, even ICC profile adjustment (calibration using Monaco unit) does not help.

[gaphic2]

Hi Matteo, welcome to the forum!

I'm running the Lenovo driver 8.442.3-080103a1-057754C-Lenovo without any real problems. Softmodding X1700 drivers is not something I've tried, I've also not seen any performance gain reported by those who have tried, but I could be wrong.

Gradients should be smooth. Have you got the color depth set to 32-bit? Also check the Catalyst powerplay settings: there's an option for color depth reduction in there and I've noticed powerplay seems to have a life of its own sometimes.

Are you using the FLX.ICM monitor profile? In CCC, I've got gamma at 1, brightness at 0 and contrast at 100, and everything looks fine. I recently bought another flexview and although it has the same LG panel, there is a small difference in color.

[Matteo]

...

Thanks for an answer.
For sure I have 32 bpp and PowerPlay is turned off (strange feature, actually). I have calibrated my monitor with Monaco device. So my ICC profile comes from it.
Please check this image, for example:
http://project1.online-mex.de/tmp2/IMG_0221_dr2.jpg

you should see gradients in angles, the problem is that almost all notebook displays support only 262K colors (6bit) and no 16M (8 bit) as it should be... so I think the only possibility to avoid such gradients - to dither it using video driver.

[gaphic2]

Dithering is on, otherwise you'd only see 64 levels of gray.

The human eye can typically differentiate between 400-700 shades of gray, with radiologists at the top of the curve. That's why there are medical displays. You need a 10-bit panel for that kind of range.

There are notebooks with 8-bit panels, in some 17" models. The important point though is what the stuff you're making will be used for. If it's print, check with your printer what he needs to avoid banding. If you're designing for the web, much will depend on the monitor of your end user. Not something you can do much about.

What you can do is add 1% of noise in Photoshop. That gets rid of the banding even on your 6-bit panel.

[Pascal_TTH]

I will check your project tomorrow with my T60p.

I just look at it with my wife on her T60p. Your picture is fine and color gradiant is very nice.