Inspiring

Question

How do I change stroke borders from points to pixels?

Forum|Forum|6 years ago
July 24, 2019
4 replies
2517 views

I am preparing some images for digital screen projection and need to put a grey border around every image. In LR print module I have tried to convert points to pixels but get keep getting lost in the equation. Can I set a default to change the stroke border width from points to pixels as I will need this again. Thank you.

lightroom stroke border pixels points

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RogerG40767081Author

Inspiring

Thanks, I shall have to read and digest all this. Mathematics was never my strong point! My images will all be a standard 300ppi JPEG but may vary slightly in dimensions but generally will be a camera club standard in 1600 x 1400px. I need the border if the image is dark so to illustrate the crop size against a dark projected screen. Thanks again.

R

richardplondon

Community Expert

You've stated a desired output resolution of 1600 x 1400px for your JPG. You've also mentioned 300ppi - but that is not IMO a useful or a relevant stipulation and for this purpose, I advise you to disregard it.

All that counts, is the proportion of your picture border line widths, within your entire image that you submit. Whether that image is then viewed small on a tablet, or projected huge onto a wall, its actual physical scaling will be arbitrary (and outside of your control). But considered purely as pixels, all of that scales up and down TOGETHER.

You can use LR's Print module to make a layout for your submission. But the Print module refers to a particular physically scaled page setup. The sizes of margins, stroke widths, image cell sizes etc all refer to that physical scaling. So a margin (say) 1 inch wide takes up a larger proportion of a small page size, than it does of a large page size. And the same is true for a stroke width. So you need to concentrate on the actual requirement and I suggest you can simply work visually, as to what looks right.

As part of that though, you will need to ensure that the shape proportions (aspect ratio) of your page setup correspond to the required specs for submission. And if you are doing that, I suggest that it's worth making life easy for yourself by setting up an 'easy' mapping of page dimensions to pixel dimensions, as in my previous post.

elie_dinur

Participating Frequently

72 points is one inch; so if the resolution is 72 pixels per inch, then 72 pixels = 1 inch = 72 points and 1 point = 1 pixel. But if the resolution 300 ppi, then 300 pixels = 1 inch = 72 points and 1 point = 300/72 which is 4.167 pixels.

R

richardplondon

Community Expert

The definition of a Point, as a unit of physical measure, is: 1/72nd of an inch.

If you define a page size (in your Print layout) which is however many inches wide and high your desired output in pixels is - multiplied by 72 -

[edit: more clearly: divide the number of needed pixels by 72, to get the number of inches for the page size - when you specify 72ppi for output, LR will multiply back up to achieve the same resulting figure]

and if you then set an output resolution when you "print" to JPG, of 72ppi - then in that special circumstance, 1 point = 1 pixel.

And by saving this page setup as a named user preset, you'll only need to do those calculations once.

Worked example:

say your finished JPG needed to be, so as to keep the numbers easy, 1440pixels wide (by a suitable height dimension according to the required display aspect ratio).

So that's 20 inches wide when considered at 72ppi (because 72 x 20 = 1440).

So you'd go into the page setup and make a Custom page size that was (say) 20 inches wide x [whatever's needed] high.

And then you'd lay out your photos etc on this page, bearing in mind that each inch maps to 72 pixels, and each point maps to 1 pixel.

And you'd select 72ppi as the output resolution to ensure your final output comes out at the right pixel dimensions, and you would not set any output dimensions override to the contrary.

Akash Sharma

Legend

Hi RogerG,

As you're looking to set the border measure to pixels, you may create a preset in Lightroom and keep using it for future edits.

Thanks,

Akash

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