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HDR photos with the GIMP

Step 6Make the dark layer mask

Make the dark layer mask
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  • desaturatedark.JPG
  • setcurves1.JPG
  • setcurves2.JPG
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Now go back to the dark stock image. Desaturate the image (convert to greyscale) with Layer -> Colors -> Desaturate. This forms the basis of your layer mask- the white parts will be opaque in the composite, and the dark parts transparent, meaning the composite will just take the correctly exposed parts of the dark stock image.

If the image is mostly black and dark grey like this one, you will want to brighten it up a little. Go to Layers -> Colors -> Curves... and you should see a histogram with a diagonal line across it. The "lump" in the middle of the histogram shows the brightness levels of the grey parts in the layer mask image. Drag the middle of the curve upwards so the part above the spike on the histogram is near the top of the window. Your image should now be a lot brighter. This part is not an exact science- the more you raise the curve, the more the composite will draw from the dark stock image, so the more pronounced the HDR effect will be. Experiment to find the best values for your photos.
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5 comments
Nov 7, 2011. 5:49 AMwaiting1962 says:
For those having issues using GIMP see this MOD of Gimp .. it makes it more like Photoshop's interface....

http://www.gimpshop.com/

"GIMPshop is a modification of the free/open source GNU Image Manipulation Program (GIMP), intended to replicate the feel of Adobe Photoshop. Its primary purpose is to make users of Photoshop feel comfortable using GIMP. It shares all GIMP's advantages, including the long feature list and customisability, while addressing some common criticisms regarding the program's interface: GIMPshop modifies the menu structure to closely match Photoshop's, adjusts the program's terminology to match Adobe's, and, in the Windows version, uses a plugin called 'Deweirdifier' to combine the application's numerous windows in a similar manner to the MDI system used by most Windows graphics packages. While GIMPshop does not support Photoshop plugins, all GIMP's own plugins, filters, brushes, etc. remain available. Host Unlimited Domains on 1 Account Due to the changes to the interface, many Photoshop tutorials can be followed in GIMPshop unchanged, and most others can be adapted for GIMPshop users with minimal effort."
Jan 3, 2009. 9:54 PMrayhdavidson says:
I am amazed how much stuff one has to wiggle through just to get to be making a HDR image!! Or" To just to make a Colour Photo to be partly Black and White. Trying to follow some of these instructions are just plain difficult. This is mainly because it is often assumed that one knows where to look for what button or icon to press when an insttructions says; Paste image on to layer" Ok" Sounds simple. But wait! Now show me where to go to do this and what sequence to follow instead of just written basic intructions. They are ok if you know the Gimp program. What about the ones who are trying to make sense as to where everything is and what sequence to follow! Gimp is obviously a fairly loaded Software with all sorts of goodies. Just not user friendly. No wonder it is Free! I have a paid version i use to do HDR images with and it works great. Easy to follow and simple! It aslo has all the funtions one needs to make great HDR images. I was curious to see how Gimp would be for me. I'll stick to my paid Program. As i always say" Keep it simple. The world is complex enough as it is. Cheers" I have a HDR
Apr 3, 2009. 1:40 PMScwounch says:
No wonder it is Free!

Yeah, cause professional-grade, feature-rich programs that took years of volunteer time to develop are obviously worthless!
Dec 16, 2009. 3:02 AMsp_key says:
Like linux, drupal, php and almost all programming languages?

Gimp might be free but it only needs a skilful OP to produce good work.
Jul 17, 2011. 5:22 PMcpalacios gómez tagle says:
"Skillful OP" is someone who takes time to learn to use any programe. I believe GIMP is a masterful piece of software, made an enthusiastic community, and most of the beau tiful creativity comes from tenacious people.

If you're used to eat only steaks, you will never understand the healthy fish for your diet.
Apr 30, 2009. 7:54 AMamando96 says:
gimp is awsome, but this new version kills me, idk where half the stuff are :S
Jan 30, 2008. 3:46 PMhelenst says:
There is an option on the "add layer mask" dialog, "Grayscale copy of layer" which makes this a bit quicker.

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