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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 > Posterization with Gaussian blur

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AuthorSubject: Posterization with Gaussian blur   [Go to Bottom of Page]
Sergio Bartelsman
Posted on Thu Aug 7, 2003 10:04 PM

Hi, thanks a lot for the great info on this site. there is something I haven't been able to figure out :

I make a layer mask in PS 7 to which I am going to paint basically in the center so that I can then afterwards darken my image borders a bit with a curves or levels tweak. After I paint my "oval" in the center of the image (no borders) I apply a very big Gaussian blur so that my tweak is going to be very even and it doesn't show up fake.

When I apply the blur and zoom in, the transition from black to white looks posterized, with very fine banding. Why is this and how can I overcome this? I did work out another way of producing the same result in 16 bit with History states, but without the benefit of adjustment layers. Is there some dithering checkbox somewhere to check or uncheck? (couldn't find it). I would like to understand why this happens. Thank you again.


Sergio


... this thread contains expert advice from Andrew Rodney, Martin Evening and Jeff Schewe.




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