RE: Megapixels and Crop % Before Denigration

Started Feb 11, 2012 | Discussions thread
skyglider Veteran Member • Posts: 4,541
RE: Megapixels and Crop % Before Denigration

docbar85 wrote:

What happens to the pixels of 4000 x 3000 image sent to walgreens to be printed on a 4x6 print? Does some of the pixels just get deleted? Does it just just cropped to fit?

Images 4000 x 3000 are in the 4:3 aspect ratio while 6x4 inch prints are in the 3:2 aspect. Walgreens will first crop equal amounts off the top and bottom of the image to get it into the 3:2 aspect and then resize the image down to 1800 x 1200 pixels for printing on 6x4 inch photo paper at 300 dpi. Resizing "down" doesn't invent pixels so the images are excellent.

This is why cropping 4:3 aspect images to the 3:2 aspect before sending to Walgreens is best. Sometimes the top of the head is close to the top of the image. Cropping at home to the 3:2 aspect can leave all of the top and crop only the bottom. It's better to crop the bottom than to crop the top of the head(s) off.

Personally, I set all of our cameras to the 3:2 aspect since my wife does not use computers and only wants prints. This allows framing the subjects with prints in mind and negates Walgreens from indiscriminately cropping equal amounts off the top and bottom. Also, the 3:2 aspect is closer to the 16:9 aspect of HDTV sets than the 4:3 aspect is, so it helps when making slideshows too.


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