Go Back   RetouchPRO > Technique > Photo Retouching
Register Blogs FAQ Site Nav Search Today's Posts Mark Forums Read

Photo Retouching "Improving" photos, post-production, correction, etc.

Optimize Image Contrast

Thread Tools
Old 05-05-2010, 11:31 PM
colorexperts's Avatar
colorexperts colorexperts is offline
Junior Member
Join Date: Apr 2010
Posts: 6
Optimize Image Contrast

When you see a sharp edge in an image, it's because the difference between dark and light—that is, contrast—is higher along that edge than in other areas. When you apply a sharpening filter in a program such as Photoshop, you boost contrast only along edges, creating the illusion of heightened sharpness. But it isn't just edge contrast that affects whether you perceive an image to be sharp. Every adjustment that affects overall contrast contributes to what looks like sharpness. You can apply contrast to the entire image, to specific tonal ranges within the image, and to specific areas.
Reply With Quote top
Old 05-07-2010, 06:50 AM
W.Smith's Avatar
W.Smith W.Smith is offline
Senior Member
Join Date: Mar 2009
Posts: 127
Re: Optimize Image Contrast

Who would have thought!
Reply With Quote top
Old 05-07-2010, 07:58 AM
flexmanta's Avatar
flexmanta flexmanta is offline
Senior Member
Join Date: Dec 2009
Location: Spain
Posts: 339
Re: Optimize Image Contrast

You can apply a drastic contrast increase to a smooth gradient and still cannot say you have made it sharper. There is a need to differentiate between the terms. If you wanted to define sharpness in terms of contrast increase, you should add the word local. Sharpening is an increase in local contrast constrained to small radii.

It's good practice to see the high pass as the opposite of the low pass or gaussian blur, and understanding camera introduced anti-aliasing is a good step in understanding the difference between "non-sharp" and "out-of-focus". You can fix antialiasing, but you can't really cure out-of-focusness.

Last edited by flexmanta; 05-07-2010 at 11:57 AM.
Reply With Quote top

  RetouchPRO > Technique > Photo Retouching

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
detect landscape or portrait image tripitaka Photoshop Scripting 11 11-09-2009 05:32 AM
Need Pointers on how to Optimize for Web like a P Brsynk Photoshop Help 4 10-19-2009 10:08 AM
Adding brushes to your image DCPhotography Photo Retouching 3 09-26-2009 11:08 PM
3D element in 2D image pixel_monkey Computer Generated Images 12 06-20-2008 12:08 AM
Using Neat Image soulsinsepia Photo Restoration 6 02-24-2008 10:52 PM

All times are GMT -6. The time now is 09:12 PM.

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Copyright © 2016 Doug Nelson. All Rights Reserved