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Book Review: Mastering Digital Photography and Imaging(Updated)
Monday April 26, 2004
by IR Staff

IR Staff reviews Peter K. Burian's latest book, "Mastering Digital Photography and Imaging."

Digital Workflow for RAW Processing: Part IV - Batch
Thursday April 1, 2004
by Jeff Schewe

The fourth in a five part series, Jeff demonstrates the application of settings from one image to a series of images within Photoshop.

PDF Presentations
Thursday March 11, 2004
by John Paul Caponigro

John Paul Caponigro discusses an under-used feature of Photoshop. Allowing you to use the automate function to create universally viewable PDF slideshows!

Black and White Conversion
Monday March 8, 2004
by John Paul Caponigro

A outline of Black and White conversions as well as a free Photoshop Action.

Digital Workflow for RAW Processing: Part III - White Balance
Monday March 8, 2004
by Jeff Schewe

Third in a five part series, Jeff Schewe demonstrates how to achieve an accurate White Balance when using Camera Raw.

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Software > Inside Photoshop > Easiest Way to Make a Mask Using Image Itself

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AuthorSubject: Easiest Way to Make a Mask Using Image Itself   [Go to Bottom of Page]
John Hollenberg
Posted on Fri Jul 11, 2003 10:08 AM

What is the easiest way to make a mask from the image itself?
Example: I have a sunset with silhouette and want to select only
the silhouette (which may have a complex shape) to bring out a little
bit of detail. So far, the best I have found is:

1) Drag the color channel (R, G or B) with the best separation to
the copy icon on the channels palette
2) Use Image -> adjustments -> threshold (I want a hard-edged mask for
this application) and select the threshold that produces the best
separation
3) Clean up extraneous areas with brush or use marquis tool and fill with
black or white

This produces pretty good results quickly, but a certain threshold may produce a good separation in one area and not in another. I found I could work on two
copies of the channel and use different values for threshold, then subtract selections, etc. to produce a very good match. However, these additional steps ate up so much time that it wasn't "quick".

Other ideas?

Thanks.

--John


... this thread contains expert advice from Katrin Eismann.




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