Thursday, August 28, 2008

Image size limit test

posting a 7Mb image 3072 x 2304 pixel

Result: post image is 320 x 240 (blogger medium size), when opened by clicking displays a 1600 x 1200 image, when right-click "save-as" is used image downloads as 1600 x 1200.


Greg said...

you're right, and that's what I get doing that with Becky's portraits. But the 8X10 printout is sharp with great color, and to see the pixelization takes lenses. I'm wondering if the ".jpg" format is encoding more information than raw pixels. Isn't ".jpg" a nine-to-one compression algorithm? It'd be interesting to see what ".raw" or ".tif" images do on blogger.
On top of image format, there's the issue of inkjet resolution to consider too. It's more than I care to fuss over at the moment.

Randy Durand said...

Our little photo printer does 4800 x 1200 DPI. Probably 1200x1200 at standard print speeds. Full resolution of a 4x6 inch print would then be 7200x4800 or 34 megapixel.

My 7 megapixel camera yields 3072 x 2304. On a 4x6 print this is about 500 DPI. On an 8x10 print it would be about 300 DPI which was the original lazer printer resolutions.