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Topic : "Photoshop glitch???" |
Gimbal8
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Joined: 08 Apr 2001
Posts: 685
Location: FL
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 Posted: Fri May 04, 2001 12:33 pm |
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I posted this on another forum but since then I've been doing some experiments and I noticed I'm having this problem with the dodge/burn tool as well as the airbrush.
I lay down a solid color and either using the dodge tool or airbrush color over it and for some reason there appears this faint repeating square pattern of noise on the picture. Here are a couple pics that first made me see it. (Just ignore all the perspective problems with the nose and eyes etc, I was experimenting anyway). The second one has had some level adjustment which made the problem easier to see.
These were completely done in Photoshop4 with a Wacom tablet but I was able to reproduce the same problem on a different machine (still photoshop4 though) with just a mouse. I tried changing brush spacing and although it has an effect on it it doesn't make it go away.
Anybody know what this is or how to make it go away? |
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Loki
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Joined: 12 Jan 2000
Posts: 1321
Location: Wellington, New Zealand
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| Posted: Fri May 04, 2001 1:51 pm |
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It's probably mach-banding. Inherent weakness of 8-bit color-space that leads to quantisation in the image when dealing with values that are close to each other ...
Happens also when you're working with a faint airbrush on a similar color ...
Adobe puts all that web-crap into PS, but we're still waiting for full 16-bit per channel support after all those years - makes me mad |
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Frost
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Joined: 12 Jan 2000
Posts: 2662
Location: Montr�al, Canada
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| Posted: Fri May 04, 2001 4:48 pm |
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| Adobe knows what's important... web crap! That's where the money is!! Screw 16-bit precision or a tool/brush interface that makes sense... as long as it exports web friendly graphics and transparent GIFs, who can complain or ask for more?! |
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G Man
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Joined: 14 Apr 2001
Posts: 14
Location: England, UK
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| Posted: Fri May 04, 2001 5:00 pm |
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Totally agree. I just have a similar problem using painter(classic) that when I am adding water to it It seems to 'band' the colour. Is this because of the low resolution, or is it just a bug? I mean I thought it was meant to use industry standard colour charts.
Thanks
-Gav |
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Freddio
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Joined: 29 Dec 1999
Posts: 2078
Location: Australia
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| Posted: Fri May 04, 2001 11:15 pm |
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yea I actually noticed that today when using photoshop.\
so I just switched back to the paintbrush  |
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Gimbal8
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Joined: 08 Apr 2001
Posts: 685
Location: FL
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| Posted: Sat May 05, 2001 8:32 am |
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Damn. Just when I thought I found a rendering method I might get good at. I guess getting a new version of Photoshop wouldn't help then. Maybe I'll just say that it is the texture of the canvas I was painting on since it has almost such a pattern 
Maybe I'll re-install the little version of Painter that came with the Wacom. |
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