Grid Lines with Equidistant Spacing

[davshev]

I'm a Photoshop user and recently switched to Affinity.  I am trying to apply a grid over a photo with all of the lines spaced equally.  In other words, I want to be able to choose the number of subdivisions, ie quarters, eighths, etc.   See attached image.

[walt.farrell]

Assuming you're using Photo V2, from the menu choose View > Grid and Axis... and then choose a Basic grid rather than the default Automatic grid. Then set it up as you want, and possibly save a Preset that you can choose later for other images.

[davshev]

I've tried doing that, but the grid it gives me is not exactly subdivided equally.  I've tried the other settings, but I don't know how to get it to make the spacing all perfectly equidistant.

See attached image.

[walt.farrell]

Are you talking about the alignment of the grid or the spacing? 

Your chosen grid dimension of 128 px is not an even divisor of either the image width or height.

[GarryP]

If you want to get a grid where the squares defined by that grid are all of the same size, and you only see whole squares, then you need to calculate the common factors of both the height and width of the image/document you are editing and use one of those factors as the grid spacing size.

There are various common factor calculation resources on the web.

For example with an FHD-sized image, using https://www.calculatorsoup.com/calculators/math/commonfactors.php I can enter “1920, 1080” into the input field and press Enter. I then get a list of common factors, each of which I can then enter into the Spacing field of the “Grid and Snapping Axis” dialog to get a nice grid.

In my attached image I have used the Greatest Common Factor of 1920 and 1080, which is 120 (both 1920 and 1080 are divisible into integers by dividing by 120).

If there are no common factors then you cannot do this.

Note: You might be able to do this with Column Guides, if the document/image has the right height to width ratio, but it will probably require even more calculations anyway, so that’s maybe not a better solution. (But Column Guides, with an Outline Style, are possibly better if you want rectangles instead of squares.)

[lepr]

14 hours ago, davshev said:

ie quarters, eighths, etc.   See attached image. [screenshot of Photoshop]

There are several solutions. For example, Column Guides (View > Guides...) as shown below will give you the same grid as in your Photoshop example.

 

[davshev]

@lepr YES, that's what I wanted.  Thank you!😊