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Old Nov 25, 2005, 2:07 PM   #1
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Join Date: Nov 2005
Posts: 6

I've been doing some comparison tests between Qimage, PhotoZoom Pro, and Genuine Fractals 4.

While Qimage certainly "holds it's own" in quality, and beats the others in speed; I found it strange that the "processed" results from Qimage resulted in half the file size of PhotoZoom, GF-4, or Photoshop Resize.

Example: Started with a converted RAW file of 14.6"W X 9.73"H X 240 ppi. I went for a processed size of 15W X 10H X 720 ppi.. In Photoshop's Resize dialog, that would result in an image file size of 444.9 MB, and that's also what I get with both GF, and PhotoZoom.

In Qimage, however, the View Print Queue shows 15 X 10: 234 ppi - 233MB. The "Print To File" box shows 15 X 10 in (720 X 720) ( Interp= MAX / HIGH / Pyrimid -10); and the processed result, when opened in Photoshop, is 15 X 10 X 720 ppi at 222.5 MB.

How can Qimage produce an image file of the samedimensions, and resolution as the other three methods---- and "end up" with half the file size????

That would be a good thing, but hardly seems practically possible.


LeighA is offline   Reply With Quote
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Old Nov 26, 2005, 11:08 AM   #2
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Join Date: Jun 2002
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Print drivers are all 8 bits/channel. Your raw file that has higher bit depth must be converted to a 24 bit image prior to sending it to the driver, so when Qimage prints (or creates a print file), you'll get 15 x 10 @ 720 PPI which is (15*720) * (10*720) * 3 channels = 234 MB. You get double the size you need when you do it in PhotoShop because it is creating a 48 bit (16 bit/channel) image. In other words, your 445 MB PhotoShop file is twice as big as it needs to be because it has data that cannot be used by your print driver.

mchaney is offline   Reply With Quote

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