I'm starting out with a 7meg jpg file, some adjustments and slight crop in LR4 and my export is only 700kb. Quality is at 100 and 34,00dpi. I don't print much, LR is new to me and this will be a 16 x 20. Will it be OK?

Originally Posted by JSPhotography I'm starting out with a 7meg jpg file, some adjustments and slight crop in LR4 and my export is only 700kb. Quality is at 100 and 34,00dpi. I don't print much, LR is new to me and this will be a 16 x 20. Will it be OK?

Double check the dpi setting when you export, and make sure you didn't set it to 34.00. I have mine set to 300 and I don't lose hardly anything when I export a jpg from a jpg. But then again, I'm not cropping the jpgs, as they were already cropped from the raw file.

GaryB

Originally Posted by BroPhoto Double check the dpi setting when you export, and make sure you didn't set it to 34.00. I have mine set to 300 and I don't lose hardly anything when I export a jpg from a jpg. But then again, I'm not cropping the jpgs, as they were already cropped from the raw file. GaryB

Thanks, dpi is deffinatly 34,000. I didn't know exactly what was needed so I looked up the max value I could specify.

FWIW, nothing is gained using 100 quality in LR. see:
http://regex.info/blog/lightroom-goodies/jpeg-quality

If you are printing this image yourself, just print your file from Lightroom itself, no need to alter the file.

If you are exporting the file to an outside vendor for printing
, you will want a minimum of 200 pixels per inch along each side of the print.

16 x 200 = 3,200 pixels for the short side, and 4,800 would be better.

20 x 200 = 4,000 pixels for the long side. 300 ppi would be better, and would be 6,000

3200x4000 = 12.8 megapixels for a 16x20 inch print at 200 ppi.

dpi is a printer specification

I think you are referring to pixels per inch needed for a quality print, which many would consider 200 ppi.

Originally Posted by arodney FWIW, nothing is gained using 100 quality in LR. see: http://regex.info/blog/lightroom-goodies/jpeg-quality

Thanks for the link, interesting read.

Originally Posted by pathfinder If you are printing this image yourself, just print your file from Lightroom itself, no need to alter the file. If you are exporting the file to an outside vendor for printing , you will want a minimum of 200 pixels per inch along each side of the print. 16 x 200 = 3,200 pixels for the short side, and 4,800 would be better. 20 x 200 = 4,000 pixels for the long side. 300 ppi would be better, and would be 6,000 3200x4000 = 12.8 megapixels for a 16x20 inch print at 200 ppi. dpi is a printer specification I think you are referring to pixels per inch needed for a quality print, which many would consider 200 ppi.

Thanks Pathfinder. I think I have the basics figured out now. My biggest problem was not knowing what I needed from a pixel standpoint for a quality print job. I'm good now.

http://pathfinder.smugmug.com/Other/...2246604_8fVpw8

A short discussion of image pixel sizes needed for printing