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10.5: Invert colors of images with Preview.app Apps
One of the hidden features of the Adjust Colors panel in Leopard's Preview.app is the ability to invert colors of an image. By default, the Black Level slider is at the left, the White Level slider is at the right-hand side. To invert colors, simply "flip" both sliders over to the other side respectively.

The effect actually takes place as soon as one of the sliders crosses the position of the other one. Like that you can actually fine-tune the inversion and contrast, creating plenty of interesting effects.

Interestingly, all other sliders are unaffected by the actual color inversion and they will alter the image as expected, and not inverted.
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10.5: Invert colors of images with Preview.app | 4 comments | Create New Account
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10.5: Invert colors of images with Preview.app
Authored by: wjv on Mar 09, '09 08:00:52AM

It's somewhat odd that if you do this, and then use the "Reverse black and white" feature of Universal access (ctrl-opt-cmd-8), you don't get exactly the original image back. The colours are somewhat "off".



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10.5: Invert colors of images with Preview.app
Authored by: Lou Kash on Mar 09, '09 08:42:17AM

I admit that I didn't play with it that much, as I only found out by accident. For precise editing I'm using Photoshop anyway, but Preview.app is often sufficient for some "quick'n'dirty" stuff. And it's possible that it's not a feature, but a bug. With Apple, you'll never know... :D

(As a side note, there IS a nasty bug with the Adjust Colors panel: if you adjust colors and then you e.g. change the size/resolution of the image, the adjust setting will be applied AGAIN. You will have to click the Revert button to get the expected result of your editing...)



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10.5: Invert colors of images with Preview.app
Authored by: wjv on Mar 10, '09 05:59:44AM

Oh, I just meant it as a random comment, not a criticism! :)



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10.5: Invert colors of images with Preview.app
Authored by: gluebyte on Mar 09, '09 04:06:30PM

I noticed that, if you move the brightness slider to the left, you get a better invert image.



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