Go Back   Steve's Digicams Forums > Software > Plug-ins & Actions (Photoshop and compatible)

Reply
 
Thread Tools Search this Thread
Old Jan 19, 2006, 4:50 PM   #1
Member
 
Join Date: Dec 2005
Posts: 62
Default

I was browsing the dpreview retouching forum, and a user wanted to know if it's possible to batch process and correct exposure on a set of pics taken on the same settings that was underexposed due to improper flash metering, well, here's what I came up with over lunch break.

It's a simple Photoship javascript that will adjust your exposure until it reach the mean histogram value (gray balance value) that you set.

From the limited time I test the script, it can provide accurate exposure compensation on images that is underexposed by up to 2-fstops, haven't tested on overexposed pics yet.

The default gray balance value is set to 108, which is around 40% gray balance, you can change it to any value you like, here are a few pointers.

1. a value of 128 would be 50% gray.

2. To batch process night scenes, set the value to around 70.

3. to batch process indoor scenes, the default value should do fine

4. to batch process outdoor scenes, set the value to around 128.

enjoy.

link=> Note: You need to copy the link and paste it into a new browser window to load it.

http://members.fortunecity.com/curti...to-exposure.js


curtis
curtisfun is offline   Reply With Quote
Sponsored Links
Old Jan 20, 2006, 6:45 PM   #2
Member
 
Join Date: Dec 2005
Posts: 62
Default

Version 0.2 of Match Exposure (it was rename from auto exposure) is up.


Description: This script is useful if you want to match the exposure all all shots you took at a certain event. Examples would be panaramics shots, or a wedding where some shots may be more under or overexposed than others.
Installation:

1. Download the zip file, and put the entire folder into your "/Presets/Scripts/" directory

2. There are two script in the folder, one is named "match-exposure.js", the other is named "match-exposure-setup.js". The setup script is for CS and CS2 users to set the grayBalance value automatically. If you have an image file with the intented exposure that is already opened, the script will extract the gray balance value from this reference image. If you don't have any image open, the script will prompt you to locate a reference image to extract gray balance value from.

3. The gray balance value is saved in the file named "matchExposurePref.dat", for Photoshop 7 users, you can change the gray balance value manually by editing this file.

4. To batch process a folder, you need to record the script into an action first by doing a test run on one opened image file, it's pretty easy to do.


members.fortunecity.com/curtisfung/photoshop/javascript/match_exposure.zip


--curtis

curtisfun is offline   Reply With Quote
Old Jan 22, 2006, 8:34 PM   #3
Member
 
Join Date: Dec 2005
Posts: 62
Default

Version 0.2.4 of match exposure is uploaded.

Changes in this version:

1. Added more error-handling routine for fool-proof operation.

2. Implemented dynamic incremental curves adjustment from fixed incremental adjustment for even better result, as well as prevent script from going on an infinite loop on some files.

3. Auto-contrast has been move to the first step to make exposure adjustment more accurate.

link:

http://curtisfung.fortunecity.com/ph...h_exposure.zip

You have to copy and paste the link above to a new browser window to download the file.

curtis

curtisfun is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 11:52 PM.