CS2 cache performance vs. onscreen accuracy

FD
Posted By
false_dmitrii
Feb 17, 2006
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440
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1
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Closed
While making some extreme level adjustments with multiple layers to correct large linear negative film scans, I realized that not only was the histogram not keeping up, but the colors and contrast of the displayed image were drifting considerably from the true results of the adjustment layers. Setting the cache level to 1 in Preferences solves this issue, but it also kills performance and disables the handy "auto" and "options" commands in Levels and Curves.

Is there a way to force a cache override to generate an accurate display when desirable without setting the cache level to 1? I know I can duplicate the layered image to a flattened one, but is there a quicker way to the same results? Viewing the large original scans at 100% is not an effective workaround, though I’ve gotten around the slow uncached performance by downscaling a copy of the original, making adjustments, then copying the layers back to the original.

I’m also curious about CS2’s on-the-fly zoom scaling. Paint Shop Pro produces a good-looking image at any zoom percentage and does so with no noticeable performance hit, yet pricey CS2 offers jagged lines, increased noise, and generally inaccurate representations of the image at any zoom that’s not a factor of 1/2. Even 50% zoom is a little tricky to interpret. Is there any trick that will force CS2 to use a slower but better resampling method for on-the-fly zooming?

false_dmitrii

false_dmitrii

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S
SpaceGirl
Feb 17, 2006
wrote:
While making some extreme level adjustments with multiple layers to correct large linear negative film scans, I realized that not only was the histogram not keeping up, but the colors and contrast of the displayed image were drifting considerably from the true results of the adjustment layers. Setting the cache level to 1 in Preferences solves this issue, but it also kills performance and disables the handy "auto" and "options" commands in Levels and Curves.

Is there a way to force a cache override to generate an accurate display when desirable without setting the cache level to 1? I know I can duplicate the layered image to a flattened one, but is there a quicker way to the same results? Viewing the large original scans at 100% is not an effective workaround, though I’ve gotten around the slow uncached performance by downscaling a copy of the original, making adjustments, then copying the layers back to the original.
I’m also curious about CS2’s on-the-fly zoom scaling. Paint Shop Pro produces a good-looking image at any zoom percentage and does so with no noticeable performance hit, yet pricey CS2 offers jagged lines, increased noise, and generally inaccurate representations of the image at any zoom that’s not a factor of 1/2. Even 50% zoom is a little tricky to interpret. Is there any trick that will force CS2 to use a slower but better resampling method for on-the-fly zooming?
false_dmitrii

Hello,

I’ve noticed the zoom issue too with the last 2 versions of PhotoShop. It seems particularly bad in CS. You’re right – it seems to manifest when you zoom to an odd percentage. I’d be happier for slower zooms if the quality was higher – PhotoShop hardly pushes any of our production machines anyway.

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