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GIMP TutorialsAdjusting lighting condition of your photo in GIMP (Showcase | Slideshow)

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trandoductin

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Adjusting lighting condition of your photo in GIMP

Post#1 by trandoductin » 07 Oct 2016, 02:18


For this simple tutorial, we'll use a photo taken of my cousin's watercolor painting.
You can find more of her paintings on her facebook page here --> https://www.facebook.com/MsSolfegge/
I usually offer to adjust the white balance on her paintings because her photos of paper where it should be white usually come out yellow-ish.
So here's what I do. Really quick and simple.
1. Open the image in GIMP.
auto_white_balancing_01_open_image.png
auto_white_balancing_01_open_image.png # (216.06 KiB) Viewed 1179 times (Watermarked | Thumbnail)
2. Right click the layer (in Layers window), then select "Duplicate Layer".
auto_white_balancing_02_right_click_layer_Duplicate_Layer.png
auto_white_balancing_02_right_click_layer_Duplicate_Layer.png # (263.33 KiB) Viewed 1179 times (Watermarked | Thumbnail)
3. Then goto menu "Colors", then "Auto", then "White Balance". This will "Auto White Balance" the duplicated layer (top layer).
auto_white_balancing_03_Colors_Auto_White_Balance.png
auto_white_balancing_03_Colors_Auto_White_Balance.png # (92.24 KiB) Viewed 1179 times (Watermarked | Thumbnail)
4. Often the white balance is too strong and overly white. But now that we have the full effect, you can click and drag along the Opacity of that layer to change how strong the effect you want.
auto_white_balancing_04_Click_and_Drag_To_Change_Opacity.png
auto_white_balancing_04_Click_and_Drag_To_Change_Opacity.png # (17.8 KiB) Viewed 1179 times (Watermarked | Thumbnail)
5. For this example, I like the the white balanced layer at 75% Opacity. So here's the result at 75%.
auto_white_balancing_05_Result_At_75_Percent.png
auto_white_balancing_05_Result_At_75_Percent.png # (236.67 KiB) Viewed 1179 times (Watermarked | Thumbnail)
6. Once you're happy with your work, you can go to menu "File", then "Save As..." to save your work as an .xcf file (which will save all layers information that you can work with later) or "File", then "Export As..." to export it as one of the image file formats (like .png or .jpeg).

And here's a comparison of before and after to show how much better it looks with some "Auto White Balance".
auto_white_balancing_06_comparison_of_before_and_after.png
auto_white_balancing_06_comparison_of_before_and_after.png # (455.36 KiB) Viewed 1179 times (Watermarked | Thumbnail)
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Post#2 by Issabella » 22 Jan 2017, 17:31


Thank you so much for your explanation. It's good to have several ways to improve light in photos. :learned_something:
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Post#3 by dinasset » 22 Jan 2017, 19:46


Tin,
you've seen the original, so you may better judge.
But - if the painting is on a sheet of white paper, IMHO the result could be this one (obtained using my WhiteBalanceStretch2)
Image
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Post#4 by tim » 22 Jan 2017, 20:10


dinasset wrote:Tin,
you've seen the original, so you may better judge.
But - if the painting is on a sheet of white paper, IMHO the result could be this one (obtained using my WhiteBalanceStretch2)
Image
Actually my cousin sent me a digital copy from the states so I haven't seen the original myself.
So I guess it's up to taste with the white balance.
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Post#5 by Pat625 » 24 Jan 2017, 16:25


Thank you for another way to correct lighting. When new in Gimp I used the auto white balance on the photo, not on an additional layer. Sometimes looked freaky so then I had to use undo, and play with levels or curves. This method of using an additional layer IMO is much better, as is Dinasset's script. Love to have different methods so if one doesn't work, the other probably will.
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