Roxie2401 wrote in post #12765037
If I understand, in your example, if I trim with the 4:5 ratio, then Convert and Save - if I want a 16x20 print, per the above chart, change the size to 4000 x 5000?
This depends on the original resolution of your image and how you want to handle enlarging.
The "standard rule of thumb" is to aim for 300 ppi, so for an 8x10 you would set your output dimensions at 2400x3000 pixels. All within a normal image resolution. But double those for the 16x20 so that you get 4800x6000 pixels as "optimal" (300 ppi) and there you have to do the "enlarging juggling act" since our DSLR images don't yet go to 28.8 megabytes!
So, at this point you bear a couple things in mind -- do you want to submit a lower ppi resolution and let the printer manage any up-rez needed, or do you want to do the enlargement yourself?
Actual results will vary depending on the original image quality as well as the resolution. People can get "good" results from a 150 ppi image, meaning that if you have the 2400x3000 dimensions or better, and your image is nice and crisp/sharp, then you can have a reasonable expectation of getting a "good" print back. Don't shrink the image at all, you just may not want to go to the hassle of enlarging it.
Which way you go is up to you and some trial and error testing!
If that is right, how does the DPI setting come into play?
As was noted above, the dpi/ppi "setting" is meaningless for digital processing and printing -- it's a label. There are some commercial labs and publishers who do want you to apply a label, and there are also some that will require you to resize an image to, say, 300 ppi, but those tend to be an exception. Find out specifically what your lab requires as well as what it advises.
And, should I be including the ICC Profile in the image?
I've always thought that you don't want to embed the printer/ink/paper ICC profile into the image. You normally convert the image to sRGB for almost all labs and shops and such and would only use the ICC profile for softproofing (and for your software to manage your printing colors, etc).
But recently a member here was told by a lab that he should embed their ICC profile rather than the "standard" sRGB color space. Hmm, I don't know about that, I would only consider it if a lab insisted that I do this. For most uses, converting the image to sRGB when exporting/ Convert and Saving/Save for Web, whatever software you are using does, makes the image manageable by most standard printers.