Calculations with Optical Instruments



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Digital Camera

Megapixels:
Aspect ratio: :
Pixels: *


Resolution in pixels x*y at a ratio a:b and p pixels:
x = √ p * a/b , y = p / x

Calculate resolution and aspect ratio of photos made with a digital camera. Enter either the number of megapixels and the ratio or the number of pixels of the photo in length and width.



Number of megapixels:
Memory card size:
Size per megapixel at RAW:
Compression ratio RAW/JPG:




Average size of one image JPG:  MB;   RAW:  MB;   JPG & RAW:  MB
Maximum size of one image JPG:  MB;   RAW:  MB;   JPG & RAW:  MB
So many average sized images fit on the memory card JPG:  RAW:  JPG & RAW: 
So many maximum sized images fit on the memory card JPG:  RAW:  JPG & RAW: 

Calculate the file size of a camera and how many photos will fit on the memory card. Size and compression vary strongly with cameras and settings, here are given approximate values. The available size on a memory card often isn't identical to the indicated size, but smaller. Connect the card to your computer to see the real size. Size differences between images are due to different richness of detail. A photo with a large, monochromatic area (e.g. blue sky) has a smaller size. This difference is stronger for JPGs than for RAWs. Here, a ratio average to maximum size of 2:3 for JPG and 9:10 for RAW is used.




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