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Use Preview to create selective saturation photos Apps
If you've seen photos which have been edited to keep only a portion in color, then you've seen something called selective saturation. I recently discovered these images, and wanted to play around with them, but I couldn't round up the chips to go out and buy Photoshop CS4 for such a thing. Playing around with Preview, I stumbled on this method.

Open your original picture with Preview and select Tools » Adjust Color. Drag the Saturation slider all the way to the left to make the picture grayscale. Use File » Save As to save the modified image.

Now open the original (color) picture again, and select the Lasso Selection tool from the Select item in the toolbar. Use the lasso to surround the area you want in color, then copy the selection. Open (or switch to) the grayscale version of the image and paste. Drag the section to where you want it to line up, and use arrow keys to fine tune. When done, select File » Save As to create your new selective saturation photo.
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Use Preview to create selective saturation photos
Authored by: Mac Berry on Sep 23, '09 09:01:58AM

I'm sure anyone using advanced image editing tools all the time will conciser this a non-hint, but I love it as finding anything I can do in Preview that avoids the need to buy one of those expensive apps is great!

The smart lasso works pretty well too.

Thanks for the hint.



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Use Preview to create selective saturation photos
Authored by: RandyMan on Sep 23, '09 09:12:53AM
Just select and copy the portion you want colored before you adjust the saturation, and then paste it back after you adjust the saturation. No need to switch between 2 files to do this.

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Use Preview to create selective saturation photos
Authored by: Mac Berry on Sep 23, '09 09:39:42AM

Hmm, that doesn't appear to work. As soon as you de-select the pasted portion, it gets adjusted to the saturation level of the main image.

Ah OK, worked it out. You have to save the image in-between the copy and the paste.



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Try Gimp, it is free!
Authored by: googoo on Sep 23, '09 09:40:16AM
You could also use Gimp instead of Photoshop. It is open source and free, and there is a Mac OS X version. Check it out at http://gimp.lisanet.de/Website/Overview.html.

-Mark



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Try Gimp, it is free!
Authored by: Anonymous on Sep 23, '09 11:19:40AM

Or GimpShop, if you're used to Photoshop menus and terminology. There are more recent efforts too.



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Use Preview to create selective saturation photos
Authored by: CarlRJ on Sep 23, '09 01:25:47PM
Between Preview (and Gimp) on the free end, and Photoshop CS4 on the (very) spendy end, there's been an explosion of slick, capable, very-Mac-like, reasonably priced, image editors in the past year or two, including: (plus others that I can't remember). There's a review of above three, plus comments on others, here, though it's somewhat dated -- I have Acorn and Pixelmator (bought Acorn, then got Pixelmator in a bundle), and they've both evolved considerably since then.

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Use Preview to create selective saturation photos
Authored by: palahala on Sep 23, '09 03:34:02PM

The (new?) Instant Alpha select tool in Preview works good too (click and drag to increase its effect).

As a side note: when using annotations in Preview, take a look at the Annotations pane in the Inspector (Command-I) for a few more options. To use annotations for images in 10.6 no special trick is needed. In 10.5 the menu items would be inactive (unless a PDF was loaded), though the annotation toolbar would still allow for adding annotations (even for non-PDF documents).

See a simple example at Super User for what Preview can do for annotations in images.



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