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Easy way to whiten a dull background with GIMP - Kat Landreth from Pare & Focus shows how easy it is to whiten a dull background in GIMP.
It bugs me when I think the background in my photo is white when it’s really off white. Even if the background of my photos is just a little darker than white it’s obvious when I upload it to my white website.
Check out this image:
The gray GIMP background makes my photo’s background look white in comparison. But trust me, it’s not white.
That made me think. Maybe I could change my GIMP background to mimic my website. So I did. Now when I use a simple levels adjustment to whiten the background I know it’s perfect before I upload.
Make GIMP mimic a white website:
Open your photo in GIMP.
Go to Edit > Preferences in the main GIMP window. The Preferences window will appear.
3. Expand Image Windows
Expand the Image Windows options on the left side of the window by clicking the little arrow that’s next to it. Choose Appearance.
4. Custom Colour
Choose Custom Colour from the drop down menu next to the words Canvas Padding Mode on the right portion of the Preferences menu.
5. Custom Padding Colour
Make sure the Custom Padding Colour is white. If the little box is not white click it and choose white from the color options. Click OK.
Is there a yellow and black dotted line around your image? If that’s turned on you won’t get the full effect of mimicking a white website. Here’s how to turn it off:
Go to View in the main GIMP window.
7. Uncheck a box
Uncheck the box next to Show Layer Boundary.
Now that my photo is displayed against a really white background I can see at a glance what’s not white. As I make corrections I can easily tell when I’ve got it just right.
Whiten a dull background with levels:
1. Duplicate the background layer
Duplicate the background layer by holding Shift + Ctrl + D on your keyboard.
Go to Colors > Levels in the main GIMP window. The levels window will appear.
As you drag the arrow you should notice your white background getting whiter. When it’s perfectly white it will blend seamlessly into the GIMP background. Click OK.
If your whole photo needed lightening it might look perfect now. But making this adjustment might make your subject too bright. That’s easy to fix with a layer mask.
Tone down the effect on your subject:
1. Add Layer Mask
Right Click the Background copy layer and choose Add Layer Mask from the menu that appears. A Layer Mask window will appear. Choose White (Full Opacity) and click Add.
2. PaintbrushGrab the Paintbrush from the Toolbox window by double clicking it. I like to use a Fuzzy brush. I set the Opacity of the brush to 50% to start.
3. Foreground colour
Make sure the Foreground Color is set to Black.
4. Select the Layer Mask
Make sure the layer mask is selected (the layer icon will have a black border around it, the layer mask icon will have a white border).
Paint over areas that are too bright in the main GIMP window.
You should notice the subject start to change back to normal brightness as you paint. If it’s not getting toned down enough just turn up the opacity of the brush and keep painting.
You can see what my layer mask looked like when I was done here:
I turned up the opacity of the brush for the wooden block portion of the picture. That part of the mask looks black. The soft brush prevented hard lines between the areas I masked and the areas I kept bright.
When everything is perfect you can merge the visible layers and finish doing any editing you have left to do.
It just gets easier
You only have to set up GIMP once for this trick. Even if you close GIMP and restart it your new appearance settings will be saved. Instead of following all of the steps in this tutorial you’ll only have to follow the Levels and Layer Mask part. Pretty cool, eh?
I leave GIMP set up like this most of the time. So much of the work I do ends up online and more often than not it’s on websites with white backgrounds. It’s incredibly handy to have GIMP mimic the look of those white websites. I know my pictures will look great before I upload and I only have to edit them once.
Kat Landreth is the writer for PareandFocus.com - a site for budget friendly photography tips, tricks, and tutorials.
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