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FORUMS Post Processing, Marketing & Presenting Photos RAW, Post Processing & Printing 
Thread started 26 Nov 2012 (Monday) 14:37
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Lightroom and ProDPI

 
jeljohns
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Nov 30, 2012 08:04 |  #16

tonylong wrote in post #15307077 (external link)
Hey, before we go any farther, please read these threads:

https://photography-on-the.net …/showthread.php​?t=1132002

https://photography-on-the.net/forum/showthre​ad.php?t=83445

https://photography-on-the.net …/showthread.php​?p=3740438

Take the time to absorb them and get some solid understanding under your belt, then review the stuff in this thread, and if you have further questions, ask away!

Thanks for the info, I'll read up on them! These all refer to photoshop, but I'm talking about exporting from lightroom, because I was batch exporting all my files.




  
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tzalman
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Nov 30, 2012 09:50 |  #17

jeljohns wrote in post #15307801 (external link)
Because I don't know. I don't enter any information, I just export at the size the file was when I imported from the camera, with the exception that it is now a jpeg and I leave it at 100% quality.

This is where I'm confused because I didn't know you had to enter pixel dimensions in lightroom to export.

You don't have to. Read again what I wrote:

If the answers to the above questions are negative - you are not cropping in LR and the Resize box is not ticked, then you are sending a 3744 x 5616 pixels image, more than enough for a 12x18 inch print at 300 ppi.

OK, so you are sending them a 3744x5616 pixels image (you really ought to read enough of the manual to know what size images your camera produces) and ordering an 8x10 print. This is a real resolution of 468 ppi, not the 240 ppi that the lab said they received; so, as Moppie suggested, the problem seems to be that your file is carrying a 240 ppi tag which is confusing the ROES. In the LR Export dialog page, do not check the Resize box, but do change the Resolution number to 300 ppi (the same advice Jay gave three days ago) and this will give your file a number that will make the lab happy.


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dmward
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Nov 30, 2012 10:42 |  #18

I did a quick look at the PRODPI site.
There is a page in their support section that specifies prints sizes based on 300 pixels per inch.
My guess is that they have their software setup for that and don't want to do anything on a print by print basis.

Presumably the ROHS interface they have does make adjustments when an image is cropped.

If you are exporting the JPGs from Lightroom using the export module in the two spaces where 1024 is should be a number that is equal to 300x the size print you are ordering.
To make life easier save the various sizes as presets.

If you want, for clarity, set the pixels per inch to 300. That really has no meaning but will help you remember the relationship to print size based on the lab's requirements.


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Lightroom and ProDPI
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