Category Archives: How-To

Blur Background to Enhance Subject

Here’s a short method to allow you to highlight a subject in an image while blurring out the remainder of the photo.  You can experiment and control how blurry you’d like to make the background/non-focused area.  There are a few different ways to get this effect, so keep that in mind and use what works best for you.

For these methods, I will assume that you have GIMP installed and that you are capable of finding and opening your image before attempting the changes.

To see larger versions of the images, click them so they can load in a new tab.

Free online stock sample image, from, used in this post.  Save it to your local computer before beginning the  tutorial.

Feel free to comment with your experiences in making a blurred background image in GIMP.

1.  Open your image in Gimp
2.  Duplicate your image layer into a new layer and hide your original image layer.  We will save it in the event we need it.  If you want, name your new layer as “Blurred”.
3.  Select the “Blurred” layer and click Filters on the menu bar.  Click Blur, Gaussian Blur.  Set the radius values to 25 and click OK.  Change the value based on how your photo appears in the Preview window.  Each photo is different and may need some experimentation to find something that works well.

4.  Duplicate your original image again into a new layer, and name this layer “Working”.  Move it above the blurred layer.  At this point, the “Working” and “Blurred” layers should both be visible.
5.  Add a new layer mask to the “Working” layer.  Right-click the layers and choose “Add Layer Mask”.  On the dialog window for the mask, choose “Black (full transparency)” and click Add.

6.  Click the new layer mask black box to make it active.  When active, you will see a white border around the small black box.  Change your foreground color to white in the toolbox.

7.  We’re going to show the large penny in full detail, but keep everything else blurry.  Choose the paint brush in the toolbox and paint the area that you want to be in focus.  The remainder will remain blurred.  Watch your edges and zoom in as needed to paint carefully on the penny to make it visible.  If you make a mistake painting, choose black as the paint color and re-paint the problem area to return it to being blurry.


8.  After you finish painting the focus area to show through the blur, you can choose File, Export As to save it as an image.





Convert a Color Photo to Black and White in GIMP

Believe it or not, there is more than one “right” way to change a color photo to monochrome (Black and White).  This post discusses three ways to remove color from a photograph and some reasons why you would want to choose a specific method.  Remember that there is always more than one way to accomplish an effect in GIMP and experimenting will help you find the result you’re looking for.

For these methods, I will assume that you have GIMP installed and that you are capable of finding and opening your image before attempting the changes.

To see larger versions of the images, click them so they can load in a new tab.

Link to free online stock sample image used in this post:

Feel free to comment with your experiences in making a monochrome image in GIMP.   I look forward to learning how you make your monochrome images.

Method #1 – Desaturate Feature

1.  Open your color image in GIMP


2.  On the Menu bar, click the Colors menu item, then click Desaturate.

3.  You will receive a dialog window asking how GIMP should handle shading the greys.  Choose Luminosity and click OK.


4.  Your color image will now appear in black and white.


5. To save the file, click the File menu, then click Export and declare the file name, location and format.  Note:  If you choose Save or Save As, that saves the entire project, not just the image file.  In this example, we are saving the file and do not wish to save the project.

Tutorial001_046.  Finally, on the Export Image dialog, choose your quality and click Export.  Your file will be in the path you specified in step 5.

Tutorial001_057.  Procedure complete.

Method #2 -Set the Image Mode to Grayscale

1.  Click the Image Menu.

2.  Click Mode, then click Grayscale.

3.  Your image will now show as a monotone image.

4.  Export your file, if you want.
5.  Procedure complete.

Method #3 – The Channel Mixer

This method is the most advanced and allows for the most control.  By adjusting the red, blue and green values, you can really take control of the monochrome output of your image.  You can really experiment with your image to find the best way to present it in monochrome.

1.  Click the  Colors Menu, click Components, click Channel Mixer
2.  On the dialog window, click the Monochrome and Luminosity checkboxes to enable them
3.  Adjust the R,G,B values.  They must total to 100 when combined.
4. For starters, set Red at 30, Green at 59 and Blue at 11 to see what greyscale would most likely render as a starting point.  These values are different based on your source image.
5.  Experiment with each color channel to see how the color change affects the preview display image.
6.  Click OK when finished to apply your changes.
7.  Export your file, if you want.
8.  Procedure complete.
Helpful links for reference:
GIMP 2.8.14

Where Do I Find GIMP?

So you need to download GIMP?  Let’s start at the beginning then!

GIMP is completely free to download and use.  You do not need to pay any money if you don’t want to.  Of course you can donate on the GIMP homepage, and I’d wager that the folks who create and maintain this software sure could use some financial support if you’d like to donate.

GIMP runs on many platforms, including Windows, Linux and Mac.  The developers do a great job of including users from different operating systems and deliver an excellent product regardless of the operating system you choose (or not!) to use.

GIMP can be downloaded from the main site’s download page.  Be sure to download the user manual while you are there as well so you can install it locally.  It may come in helpful for you in a time of uncertainty and it won’t require an internet connection.

Happy downloading!