Method 1) Finding a picture already the appropriate size.
This is easy, go to google, search the image you're looking for and then specify the size.
https://2img.net/h/i306.photobucket.com/albums/nn242/Stenta56/3x.jpg
Just like in the picture.
Method 2) If you want a specific picture, but cannot find it in a smaller size. (With photoshop)
First, open your desired image.
Under Image, select Image Size
https://2img.net/h/i306.photobucket.com/albums/nn242/Stenta56/1.jpg
Set the width as 24 and press okay.
https://2img.net/h/i306.photobucket.com/albums/nn242/Stenta56/2.jpg
Now, I think you all know how to find save.
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For gimp, otherwise known as Photoshop's retarded younger brother:
Open your picture.
Under the menu Image, press Scale Image.
https://2img.net/h/i306.photobucket.com/albums/nn242/Stenta56/3.jpg
Enter 24x23 and press scale.
https://2img.net/h/i306.photobucket.com/albums/nn242/Stenta56/4.jpg
And save it.
On a note only somewhat related, I would say "Oh, just do this in Paint". But that won't work, as it will be pixelated. GIMP is a free program, provided by the GNU project and although I'm not condoning piracy (as I have a legal copy of photoshop), photoshop can't be that hard to find.
