Resizing photos after editing

Question

I have a question concerning resizing files after editing in Lightroom or Photoshop

scenario: 1 RAW file of 23MB (a portrait foto - as an example) customer wants a big poster of the photo 60 x 90 CM,

Can it be resized in Lightroom/ photoshop for a print of that size? For instance I save it in "Tif" format. Instead of the default size of 1000 x 1000 with a pixel density of 240 per inch I want to save it as 3000 x 6000, density 320 per inch. Is this possible?

There seems to be some confusion in your definition of "size". What is the original image size? 1000x1000 would be unusual. & why do you think you need 320 dpi for the final image? What has the printer requested? 90cm is approx 35". 6000px @ 320dpi is approx 18". None of the numbers add up. — Tetsujin, Feb 18 '19 at 14:16
Short answer: yes, you can interpolate up. Longer answer: involves knowing just how far you can push an image, what the viewing distance is, and when the two will combine to cause a crap print. — OnBreak., Feb 18 '19 at 18:27
Possible duplicate of Is it possible to scale up an image to increase the the pixel density? — mattdm, Feb 19 '19 at 14:06

score 3 · Answer 1 · answered Feb 19 '19 at 06:03

I'm sorry, but you have a lot of things mixed and confused.

The Raw file weight is not important at all.
There is no default size of 1000x1000. The default size is the one directly produced by your camera, for example, 24 Mpx. Which is 6000x4000px.

If you want a print 60x90 you need a photo of a proportion 6:9 or 2:3 which is the same, in this case as 4000x6000px.

Again why you want to change the proportion arbitrary to 3000x6000... It has no sense.

Let me explore a 24 Mpx file.

For a print of 60x90 you get right out the box:

6000px/90cm = 66.6px/cm or 170PPI, which is pretty good resolution It will be sharper than a normal magazine print. I would leave it like this.

But still, you can interpolate it to exactly double the size to maximize the resampling, and then applying some sharpening to get a file 340PPI more than enough for a high-quality print.

Resizing photos after editing

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