Name: [3583] Rede
Member: 76 months
Authored: 28 videos
Description: Just an amateur DTP, webmaster, genealogist and graphic editor. ...

Brightness-Contrast Versus Curves Tool [ID:852] (8/11)

in series: Repairing Photos With GIMP

video tutorial by Rede, added 08/08

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Showing you the difference of the Color/Brightness tool and the Curves Tool to improve the quality of your images in GIMP.

In this video I use an unidentified black & white picture postcard scanned in color at 300 DPI and saved as a JPG.

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  • Published: 68 months ago

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a well done job, very interesting and understandable (also for non english mother tongue like me)


11. roque pesantez Thu, 04 Mar 2010 18:20

Great video, thankyou very much.


10. raymond sassine Mon, 25 Jan 2010 14:32

Great video. Thanks


9. anonymous Sun, 06 Dec 2009 16:11

Thanks. Nice job. I wish you would explain a little more just what the curves mean.


8. anonymous Sun, 29 Nov 2009 20:36

hi there, thanks for your tutorial. I am just starting to use gimp and find all the tools quite baffling still. I enjoyed your video and learned some new things. Thanks for taking the time.

Regards,

- Michael


This was very helpful. I'll definitely give the curves tool a try. I overexposed some pictures on vacation in Montana. Fiddling with the brightness/contrast didn't save any of them. I'll see if the curves tool will do what the brightness/contrast cannot..


6. anonymous Sun, 21 Jun 2009 19:22

Wow -I like it


5. anonymous Thu, 02 Apr 2009 04:58

I like playing around with the curves tool. It never crossed my mind that you could use threshold or rulers to pinpoint a good white/black value. Thanks! This will make my photos better.


Sorry I am just pretty much self taught, and don’t know much of the technical end of this.

Almost white in this picture is "x:231", I subtract 15 from 255 for the "y:240" as a starting point.

Almost black in this picture is "x:49", I add 15 to 0 for the "y:15" as a starting point.

Depending on the picture you will have a different "x:" and on the "y:" you will need to move the crosshair up or down for best result. I just like +/-15 on the “y:” as a starting point.

If the "y:" was 0 or 255 the whites would be too bleached out & the blacks would be too black, and you would lose detail.


Self-quote " You didn't explain why 240 on the 'almost-black' y and 15 on the 'almost-white' y . "

I meant

"You didn't explain why the value of 240 was input on the 'almost-white' y ; and 15 on the 'almost-black' y . "


Excellent screencast! , extremely useful. Although I had to review the curves tool part quite a few times. You didn't explain why 240 on the 'almost-black' y and 15 on the 'almost-white' y . I'll explain it here: because you chose 'almost' to be defined as +/- 15 (you said it on the screencast). That means on white(255) subtracting 15 gives 240 ; and on black(0) adding 15 results in 15 .

I remember doing something similar with Photoshop in the 7.something-version era.

Love your screencast. Keep them comming.


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