Advantage of larger image size

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titoPhoto

Senior Member
#1 My D3100 can do 4608 x 3072 px. Does it mean I can do better crop than Medium 3456 x 2304?

#2 What is the difference between image size and camera megapixels?
 
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WayneF

Senior Member
titoPhoto said:
#1 My D3100 can do 4608 x 3072 px. Does it mean I can do better crop than Medium 3456 x 2304?

#2 What is the difference between image size and camera megapixels?
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1. Yes, your crop would have more pixels remaining from the larger image.
If you cropped both to 50% of the image dimensions, the larger image would still have larger dimensions than the smaller one.

2. Image size is 4608 x 3072 pixels. Megapixels is 4608 x 3072 = 14.155776 megapixels (the total count).

3. RGB data size is 3 bytes per pixel, 14.1 mp x 3 = 42 million bytes. Megabytes is a number nearly 5% smaller, 40.5 MB (still the same bytes, just a different numbering system).
Then the JPG file compresses the data to a much smaller file size (but when opened into computer memory, it is still the same 42 million bytes again).


Pixels, Printers, Video - What's With That? is a introduction to digital concepts.
 
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