Today I dared to ask a very basic but all time ignored question about the purpose of single row and single column marquee tools in Photoshop.
It will be more appreciated if the answers provided with the visual use cases.
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Out of curiosity I searched this site to see if there were any answers advising their use. I only found two: 1, 2– JohnBOct 21, 2015 at 20:50
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3 Answers
It's been a while, but before it was possible to create gradients using exclusively CSS it was a handy tool to isolate a 1 px cross-section of a vertical or horizontal gradient to use as a background image.
So if you had the following image as a mockup you could use the single-column marquee tool to grab a 1 x 64 px slice and save it as a lightweight GIF and use CSS to repeat it horizontally.
You might want to read Andrei Herasimchuk's answer to a similar question on Quora.
In short, there's no obvious purpose, but they can be used to create guides by selecting a single line and filling it with a color. This seems a bit redundant now that Photoshop has real guides, but I guess the single pixel line allows you to get a bit more creative about how you use them.
A single px line is often used as an accent to separate sections in web design. While these objects might be borders or horizontal rules when coded, in a mockup it's still important to show them.
