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Exporting high-res

Dec 29, 2010 12:05 PM

I am trying to export high res jpegs from lightroom, but when I do and try and upload to make a bigger print (11x14) it says resolution is too low. What settings should I use? The files are raw from the start. Do I have to use tiff files to make them high enough quality for that big if a print?

 

Thanks for any help.

 

Sarah

 
Replies
  • Currently Being Moderated
    Dec 29, 2010 12:42 PM   in reply to SarahEB5

    What's your resolution setting? You may need to uncheck image resizing under Export.

     
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  • Currently Being Moderated
    Dec 29, 2010 12:41 PM   in reply to SarahEB5

    The first thing to do is to tell us what settings you have made in the export section.  If you are getting an error due to resolution being too small, changing from JPEG to TIFF will not affect that.  They would both have the same resolution.

     

    John

    John G. Blair

    Occidental, California

     
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  • Currently Being Moderated
    Dec 29, 2010 7:17 PM   in reply to SarahEB5

    Your pixels per inch (ppi) is unnecessary high.

    For display on a computer monitor 72 ppi, max 100 ppi is right.

    For printing on your printer usually 240 ppi, or 300  ppi is right, unless you have a high-quality printer with a native resolution that is higher then select that resolution.

     

    But besides the ppi you have also to select the size in inches - it's just left of the ppi window.

    So for your print of 11 x 14 inch select that size or select 11" for "Short Edge".

     

     

    You have set your quality to 100. That is fine for a print, but unnecessary high for display on a monitor. For that choose a value between 60 and 80.

    BTW this value determines the compression of the jpg, the smaller the quality-number the higher the compression and the smaller the file size.

     

    Now, having said all that, the question remains why do you export your image in order to print it?

    Is there a reason that you don't just use the print module?

    WW

     
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  • Currently Being Moderated
    Dec 29, 2010 8:02 PM   in reply to SarahEB5

    What printing service are you using? Some downgrade the resolution during the upload process. Costco for example downscales the files if you do not manually deselect that option. The settings you describe, as long as you don't excessively crop, should result in files more than large enough for a 11x14 print. At that size a typical 12MP camera still gives 250ppi which is enough for a good print.

     

    P.S. the ppi setting in the export panel is completely immaterial (it's unused and only written as a metadata tag in the exported jpeg) if you don't scale to a new size in inches in the export panel. Ignore it.

     
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  • Currently Being Moderated
    Jan 1, 2011 12:16 PM   in reply to SarahEB5

    That's probably it. When you crop, you are throwing away pixels, resulting

    in a lower number of pixels in the cropped image. Dividing those pixels over

    your intended print size will result in a lower print resolution then when

    you never cropped. If you aggressively crop that might result in an image

    that is too low resolution at the intended print size indeed. You can try

    scaling up the cropped image upon export. That will result in the warning

    going away but will not make the print magically sharper. Your customer

    might not see it though as most people who are not photographers are quite

    insensitive to print sharpness.

     
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