Megapixels and giant enlargements

Started Aug 22, 2012 | Discussions thread
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philm5d Contributing Member • Posts: 724
Megapixels and giant enlargements

A company asked me if I had any local landscape images. I sent them a selection and they have purchased licenses to reproduce about a dozen.

Today I got to see 12 giant canvasses 4x3 feet in size from the original camera size files. I'd assumed they were all 12 M/P originally but this one turned out to be from my D70, a paltry 6.

Being quite stunned by the image quality I tried a bit of an experiment with some D800 files.

In adobe camera raw one gets the options of converting raw files to jpgs of differing sizes so I converted the same file both to 36 and to 11 M/P and saved both as jpgs.

I then UPSIZED the 11 M/P file with the "image size" box BACK to its original pixel size dimensions.

Now this is where I might be going wrong but to my mind I'm doing the same as uprezzing an image from an 11 M/P camera (rather than the D800).

OK so I copied the downsized/upsized image over onto a layer over the 36M/P image and so I could switch the top layer on and off to see the difference - except there was NO DISCERNABLE DIFFERENCE WHATEVER AT 100%. Obviously there must be a flaw in the logic somewhere - can someone explain please???

 philm5d's gear list:philm5d's gear list
Canon XC10 Tamron SP AF 11-18mm F/4.5-5.6 Di II LD Aspherical (IF)
Nikon D70 Nikon D800
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