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ttachment=21588:Picture_1.jpg] Question on exporting from LR.
Beginner question, what is the difference of pixel
dimensions and document size. Say I want to print
an 5x7 what's the best way to export. I guess am confused because after I export and open in PS
open in image size am not sure how the it will print out.
This is a screen shoot of what am looking at in PS, any advice> Thanks in advance.

Pixel dimensions are number of pixels wide by number of pixels high. These are divided by the dpi to determine the document size. So my 5D creates a 35mm image which is about 4200 pixels by 2800. To get a high quality print you would want a 300dpi resolution, which would yield a document size of 12 inches x 8.5 inches.

I would not export from Lightroom for a specific size print. I would crop to the ratio I wanted and export at 300 or 350dpi for the best quality print.

Frank

Okay, so if I have 10 or 20 photos that I want all 5x7 should I use PS?

You can do this two ways...
If you know they will only be printed at 5X7 or lower, you can export them at that size. I would export them with the box checked to constrain pixels to 2100X2100. This way it doesn't matter if the image is vertical or horizontal.

If you are going to do extra PS work on some of them, or if you might print them at larger sizes later, I would export them with no constrain on the pixels. Then, you can print them as they are (larger file sizes still print into smaller prints) or run them through the image processor in Bridge/Photoshop to downsize them to the 2100X2100 pixels for printing the 5X7's. Make sure you label that folder so you don't try to print a 16X20 later out of that small file size.

You lost me on the 2100x2100 part. how do you get a 5x7 out of 2100x2100?

Are you printing them out on your own printer??
you can use the print dialogue in LR (and set it up to print 2 5x7's per 8x10 sheet) or set it up in a myriad of ways to simply print these things out.

when used correctly (all of the bells and whistles) the print module of LR is great.

make sure that you use all of the right printer profiles, etc....and print some tests out.

Take the longest side, 7 inches. Multiply that by 300 pixels per inch. That makes 2100 pixels on the long side. If you do 2100 in the width and hight when exporting in Lightroom, or running the image processor in photoshop, you are telling the computer to make the LONGEST side 2100 pixels wide. So, 7 inches X 300 pixels per inch = 2100 pixels wide. If you make the width and hight both 2100 pixels, it won't matter if your image is vertical or horizontal.

Don't put in 1500 for the width and 2100 for the height, because that will only work on a VERTICAL image. If you run a HORIZONTAL image through it, it will make the 7 inches only 1500 pixels wide, and it won't have a resolution of 300 pixels per inch.

Oooh good info. I usually don't constrain any size... that should work fine for really large prints, say 16x20 right?

Ummm... actually not. You don't want to CONSTRAIN your print size for large prints, you need to make it bigger. This works good for smaller prints. I use this mostly for proofing, because I don't want full size files for proofing.

I meant it's fine for large prints if not constrained in any way since I don't typically constrain at all. OR should I put in the specific size of what I'm printing?