Please point me to the software I need . . .

Discussion in 'Image Processing' started by Jock Elliott, Jun 17, 2015.

  1. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    The Conservationist, a publication of the New York State Department of Environmental Conservation, has agreed that I should submit an article/photo essay on Peebles Island.

    Under their Contributors Guidelines, all photos need to be 300 dpi, even if they are as small as 5 x 7. What I need is some photo conversation/processing software that I can run my pix through to make sure that they are 300 dpi or that will convert them to 300 dpi, even if that means downsizing the photos.


    Cheers, Jock
  2. ReD

    ReD SC Hall of Famer

    Mar 27, 2013
    Corel Painter Essentials 2 is what I have & when I use it for resizing most of my files are saved at 300 dpi

    May even be free now but mine came with some hardware I bought
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  3. SnapDawg

    SnapDawg Rorschach Test Pilot

    Apr 18, 2014
    Canary Islands
    Real Name:
    You could use Irfanview, a free image editor with extensive batch processing options. You find the dpi settings under File > Batch conversion > Advanced - in the lower left corner.
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  4. gryphon1911

    gryphon1911 SC Top Veteran

    Feb 6, 2015
    Central Ohio, USA
    Real Name:
    Most images straight out of the camera are 300dpi, you might be OK natively.

    Most OS properties options have basic file info for images that include resolution and DPI settings.
    Last edited: Jun 17, 2015
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  5. kyteflyer

    kyteflyer ~@¿@~

    Jan 31, 2011
    Newcastle, Australia
    Real Name:
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  6. Dwig

    Dwig New to SC

    Jul 10, 2010
    Key West FL USA
    It needs to be understood that digital image files don't actually posses "inches" and therefore can't actually posses "PPI" (BTW, it is PPI for Pixels Per Inch and not DPI meaning Dots Per Inch even though some major software continues to use the wrong term). The files posses only pixels. The inches and PPI are merely data stored in the file's header that tell page layout and printing software that the file's creator wants the file to be printed at a certain PPI (e.g. 300 PPI) and that software maps the image's pixels against its concept of inches to get the reproduction size. The user of such software almost always can resize the image in the layout but doing show alter's the effective PPI.

    Most of the better image editing apps can assign a PPI to a file. It is often best to do this to the file itself before exporting a copy to send, but not all software offers that option. If your software doesn't offer any option for such cropping and sizing you can use some simple math. Example: a 5x7 image at 300PPI will be 1500x2100 pixels. Any file, regardless of what PPI specification is in its header, that is 1500x2100 pixels will effectively be 300ppi when placed in a page layout program at 5"x7". Having the file spec'd at 300 PPI is a convenience for the the person doing the layout work as it will default to the 5x7 size when placed instead of requiring that the image be scaled to the correct size after import. That is the sole reason my former co-workers invented the concept of putting such PPI data in the file header.
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  7. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    Most helpful. It turns out that DXO 9 has a setting to save files as TIFs with a 300 PPI setting and allowing image resampling. Hopefully that will meet the requirements.

    Cheers, Jock
  8. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    Got it solved with DxO Optics Pro 9.

    If you select an image in DxO 9, then select Export to Disk, a menu pops up that allows you to select format (I wanted TIFF), 300 ppi, and largest size. the largest size option doesn't have a pull-down, but you can highlight the 6 and then type in whatever number you want.

    The menu looks like this:

    DXO export options.JPG

    The only other issue I had was "How do I know that the exported image is the correct size?" It took me a moment to figure it out, but I realized that if the image was, say, 2100 x 1350 pixels, if I divide 300 ppi into 2100 pixels, then the long side of the image has to be 7 inches.

    In the words of Inspector Clouseau, "the case is sol-ved."

    Cheers, Jock