Preview.app ignores "Image DPI" when scaling

In 10.4 Tiger, Preview.app did the right thing and would print images according to what would be their correct and natural size. For instance, if I scanned a document at 200dpi, and it was 934px wide, Preview.app would print it to paper so that it was 4.67in wide. This is correct behavior.

It knows that the JPG I'm printing is 200dpi because that information is in the JFIF block. You can see this by hitting Cmd-I when viewing a .JPG and looking at the JFIF information.

10.3 was broken in this manner, it would just try to print as many pixels as it could on the printer, or scale it to take up the size of the whole page.

Apparently 10.5 Leopard does the same thing as 10.3--it won't print a document the right size. When I choose Scale: 100% the print size is much bigger than 8.5x11 when it should fit in 4.67in. The other options are scale to the size of the page.

Is there something I'm missing? Is this a regression?

Thanks!

iMac G5, Mac OS X (10.5.1)

Posted on Dec 1, 2007 3:55 PM

Reply
1 reply

Dec 14, 2007 1:24 PM in response to Jared Oberhaus

I was missing something. When I filed a bug, I got a response that asked:

+Do you have the Preview Image preference entitled “Respect image and screen DPI for scale” checked on or off and does either way make a difference to your workflow?+

The result is that when this is chosen, the scanned DPI is respected not only on the screen but also for the printed output. This is what I expected. Thanks Apple!

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Preview.app ignores "Image DPI" when scaling

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