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10.4: How to drag-scroll oversize images in Preview Apps
If you open a PDF in Preview, you can have the Tool Mode button in the toolbar. One of these tools is the Scroll Tool, which appears as a hand icon so you can grab the PDF and move it around. You can also switch between tools via the Tools menu and its related keyboard shortcuts.

However, if you open an image in Preview, there is no Tool Mode button in the toolbar -- and all the tools in the Tools menu are unavailable, except for the Select Tool. So here's the hint: if you press the space bar, the Select Tool will switch to the Scroll Tool, which I tend to refer to as the hand tool, since that's what its icon is. You can then grab oversized images and 'scroll' them around via dragging. Presumably this keyboard shortcut is referenced from Photoshop, which has long used the space bar as a quick keyboard shortcut to the hand tool.

Also, this tip is in reference to Preview 3 in Tiger. I don't think previous versions of Preview split the toolbar capabilities between images and PDFs.
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10.4: How to drag-scroll oversize images in Preview | 2 comments | Create New Account
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10.4: How to drag-scroll oversize images in Preview
Authored by: murph on Sep 18, '06 02:57:04PM

Fortunately, I learned this hint awhile ago, although I can't remember where I saw it now. Although I'm fine with Preview being consistent with other apps such as iPhoto having the select tool as default, I can't for the life me understand why the UI for accessing the scroll tool was buried in Tiger's version of Preview. At least make it accessible to the user via the tools menu or as a selection for inclusion in the toolbar, especially since the scroll tool was the default selection in previous versions of Preview.

Frankly, Preview was an absolute bug-fest when 10.4.0 was released, and although some bugs have been eliminated in subsequent releases of Tiger, it's still not on par with previous versions, even at this late date. Scrolling through oversized images in Preview was a jerky, painful, ugly mess when Tiger was released, and roughly about 10.4.4 Preview finally got some of the smooth scrolling ala Panther back when viewing oversized images. Well, almost. There are still some oversized images (ordinary jpegs) that I have that Preview still has problems with (if you scroll using the scroll bars, it seems like Preview's display lags momentarily, as if it's catching up to the point where you are scrolling to), although scrolling overall isn't as bad as it was before. But here's the kicker: the very same oversized image will not exhibit that problem and scroll smoothly with the scroll bars IF you set Preview's preferences to open the image to fit the screen, THEN select view the image at it's original size. And it's odd that other 3rd party image viewers don't have the problem. Xee, for example, uses OS X's open-gl layer to display images and it's light years ahead of Apple's Preview in the smooth scrolling department. It's "butter smooth."

Then there is the problem that Preview inexplicably opens oversized images at the bottom of the image instead of the top, which still remains as of 10.4.7. For a simple basic image viewer, Preview, imo, has become a major disappointment in Tiger.

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10.4: How to drag-scroll oversize images in Preview
Authored by: moritzh on Sep 21, '06 09:25:13AM

Thanks so much, great!

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