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Working with Pressure Sensitive Tablets
Monday May 3, 2004
by Katrin Eismann

Katrin Eismann outlines the use of pressure sensitive tablets in image processing.

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.

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Software > Inside Photoshop > Photoshop Color Conversion Oddity

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AuthorSubject: Photoshop Color Conversion Oddity   [Go to Bottom of Page]
John Hollenberg
Posted on Sun Sep 21, 2003 11:24 AM

I ran into a strange phenomenon (strange to me, that is) while converting an image
in photoshop for printing in Imageprint. The image I selected happened to be in
Lab color space. Here are the two conversion methods which produce strikingly different results:

Method One

1) Convert Lab image to custom IP printer profile using perceptual without black point
compensation
2) Choose Image->Mode->Assign Profile from Photoshop menu and select "Don't Color
Manage this Document"
3) Image is now shown as Untagged RGB
4) Save and bring into IP (RGB set to None on Bitmap tab in IP). In photoshop
and when previewed and printed in IP has a ghastly magenta covering whole image
(delta E of 20 or 30--doesn't even look much like a photo).

Method Two

1) Convert Lab image to Ektaspace or Adobe 1998 using perceptual without BP
compensation
2) Convert to custom IP printer profile as above
3) Make untagged RGB as above
4) Looks in Photoshop like faded rendition of original, but previews and prints
correctly in IP

Any thoughts about why these methods don't produce identical results? There must be
something I don't understand going on here.


... this thread contains expert advice from Bruce Fraser.




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