contrast on a gradient - Digital Darkroom Forum

James C.	Jill B.	David R.	biljana m.	Salvador María L.	Paul H.	cessy k.	Gary D.

	Sign Up Now! \| Log In \| Help
	Your photo sharing community!

	Your Photo Art Is Not Just A Fleeting Moment In Social Media imageopolis is dedicated to the art and craft of photography! Upload your photos. Award recipients are chosen daily.
Click above to buy imageopolis art for your home or office.	Read About Awards, Featured Critiques and Comments - Click HERE
Check Out Today's Uploads - Click HERE Check Out Timeless Photos From The Past - Click HERE

Share On

Follow Us on facebook

Photography Forum: Digital Darkroom Forum:

Q. contrast on a gradient

Asked by Bob Huelsdonk (K=0) on 5/20/2004

I have many historical glass negatives. The box camera used evidently had an intermittant light leak across one end. Some of the negatives are quite dark on one end and quite light on the other. I am fairly familiar with Photshop (I have version 7). I would like to control the contrast as a gradient across the width of the negative but I haven't been able to find how.

Chris Hunter

Chris Hunter (K=25634) - Comment Date 5/20/2004

This is actually a fairly easy process. First you create an adjustment layer on your background, by hitting the black and white circle on the lower right of the layers menu. As soon as you see the levels menu hit ok w/o making any adjustments. Then click on the little white box to the right of the levels box to select the layer mask.

Chris Hunter

Chris Hunter (K=25634) - Comment Date 5/20/2004

the mask shows white as solid, and black as transparent. So you want to create a Black to white gradient on the mask layer, with the white on the dark side, and the black on the ok side.
After doing this go back to the levels layer, and your adjusting will only effect the part you want it to!

Chris

Chris Hunter

Chris Hunter (K=25634) - Comment Date 5/20/2004

Here is another screen shot showing the red and white background, and the Levels adjustment layer above it. The mask on the Adj. layer fades from black to white, left to right, so the all red layer gets darker in the same way.

Pretty neat, but easy to do.

Chris Hunter

Chris Hunter (K=25634) - Comment Date 5/20/2004

this shows the effect a little clearer:

Chris Hunter

Chris Hunter (K=25634) - Comment Date 5/20/2004

Also note that I completely darkened the masked image for demonstration purposes. You can adjust the masked area however you want.

Log in to post a response to this question

Return To Photography Forum Index

| FAQ | Terms of Service | Donate | Site Map | Contact Us | Advertise |

Copyright ©2013 Absolute Internet, Inc - All Rights Reserved

Elapsed Time:: 0.15625