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jack templeman

D.P.I. for enlargement

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Hi Jack! Thanks for writing in.

CameraBag preserves the pixel size of the images you bring in. For the best quality for your filetype, make sure your images are saved at the 100% Quality setting (in the Save dialog).

If you are working with physical print sizes you will need to adjust the DPI outside of CameraBag.  Because of the library we are using for EXIF support, CameraBag currently automatically sets the DPI tag to 72 on saving out. (The DPI tag doesn't actually to anything to the image file itself; it just gives directions for how it will be printed out.) Setting it to the default 72 doesn't do anything to degrade the quality of the image, and if you change the setting back to 300 in the program you print from, it will be the same as if it was exported at 300 from CameraBag.


A bit more about DPI/PPI, if you are interested:

DPI (or PPI, which is what is usually meant) on a photo is not necessarily a measurement of the digital photo file's "resolution" or "quality" in the way we often think of those terms. What determines the quality is the pixel count of the image file and the display/print size of the image.

In fact, using DPI/PPI to resize images for display will often give poor quality images. The best way to have a high-resolution image is to have enough pixels for the desired image size. (And a printer/display to handle it.) In this way, PPI is a sort of desired conversion/ratio; you can aim for 300ppi on a certain image by choosing the size you want and then making sure you have a pixel count that will give you that ratio. The formula for calculating this is:

Pixels/inches = ppi (pixels per inch) OR pixels = ppi*inches

So, for a 5"x7" photo that you want printed/displayed at 300ppi, you would need pixel dimensions of

width: 300*7 = 2100px
height: 300*5 = 1500px

If you are interested, you can read more about PPI/DPI here:



(In your case, if you want a 60-inch wide image printed at 300 dpi, then you will need a base image file that is at least 300*60 = 18k pixels wide)


Hope this helps!

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