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Real-time Image Curves (using cubic splines) - just like Photoshop
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| Submitted on: |
6/3/2007 9:46:12 AM |
| By: |
Tanner H
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| Level: |
Intermediate |
| User Rating: |
By 17 Users |
| Compatibility: |
VB 5.0, VB 6.0 |
| Views: |
20678 |
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(About the author) |
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By request, here's another first of its kind in VB: a fast, accurate, real-time image curves dialog. (This should be familiar to the PhotoShop users among us :) Curves is similar in theory to my previous "Image Levels" post and standard gamma correction, but it provides a much more powerful interface for adjusting the luminance of an image. This project provides results very similar to Photoshop's, and it allows the creation of more spline knots (32 instead of 16). The cubic spline code on which I based my code was taken from Jason Bullen's excellent "Simple Cubic Spline Curve Plot" (http://www.planetsourcecode.com/vb/scripts/ShowCode.asp?txtCodeId=11488&lngWId=1).
The code is well-commented and very fast - please post comments, requests for future Photoshop-related code, and many heaps of praise (as this was a complicated routine to sort out...)! Update 2/May/07 - disable loading of icons and warn the user against loading very large images.
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'**************************************
'Windows API/Global Declarations for :Real-time Image Curves (using cubic splines) - just like Photoshop
'**************************************
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Other 5 submission(s) by this author
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Other User Comments
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 5/12/2007 10:51:12 PM: Herman CK
Just as when PSC has been as dull as it can be since long, Tanner now
injects some freshness. If only 5% of the postings in PSC could be as
worthy as this one, PSC would have some shine again. Everything functions
out as the coder claims, and the code is clean and organized, and more
importantly not of the usual stuff being repeated again and again. Since the coder invites, would it be interesting to see the "liquify" filter of PhotoShop?
(If this comment was disrespectful, please report it.)
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5/13/2007 12:41:11 AM: Robert Rayment
Excellent DIB class and gamma effect demo. Would be a nice addition to any paint program. Thanks for sharing.
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5/13/2007 10:17:54 AM: Herman CK
Tanner: Just a few minor points for your reference in next update, perhaps (i) add a few lines to trap 32-BPP icon or a PNG item in Vista icon file to avoid runtime; (ii) add a few lines to trap runtime on non-XP when pic size well over 3 mb (since pic AutoRedraw is True) and (iii) recheck a calculation for a function in the image byte array handling class. I can send you the above mentioned if interested.
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5/13/2007 10:48:19 AM: Spector
I tried writing a image curves function a while back but never good getting it working quite right. Thanks a lot for pointing out what I was doing wrong. There isn't near enough well written, advanced image processing code for visual basic and this is a excellent addition. Look forward to seeing your next Photoshop related demo.
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5/14/2007 1:05:24 PM: Tanner H
Herman - thanks for the "minor points." They are appreciated! In the next update, I will do some basic file checking to prevent those run-time errors. I would also be interested in the image byte array function calculation error you mentioned. Please send it my way! Thanks to everyone else who has commented. Next update will probably include the ability to delete knots in the spline. Keep the suggestions comin'.
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5/14/2007 2:16:56 PM: Bill K of Boston
5 by 5 NICE Work!!!!!
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5/15/2007 6:37:32 PM: AhmedQatar
5 by 5 !!
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5/22/2007 8:25:17 AM: T.Jackson
Excellent! - curves is very powerful indeed, I use it all the time in Photoshop. *****
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