#Image compression software reddit full
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But it might be helpful to think (in loose terms) of compression as being a series of computational algorithms or shortcuts. So why the difference? JPEG compression is actually a very technical process and well beyond the scope of this post (you can read in more detail at this Wikipedia article).

#Image compression software reddit iso

(In fact, the 3.34Mb Studio JPEG would actually produce a better, clearer, sharper print, because of the low ISO and high-quality studio lights and camera lens).

Remember that both family images are equally sized pixels from the same camera, have the same high resolution and are both optimal for producing a 14×11” print. We have also included the images saved as Photoshop levels 10 and 8 for comparison (involving more compression, but still regarded as good/decent quality JPEGs).Īlthough we have used the studio image as an extreme example, there is still quite a surprisingly big difference. The table below shows that at the highest quality (100%, lowest compression, Photoshop Level 12)) JPEG, the file size for the studio image is 3.34Mb, whilst the location JPEG 100% image is much larger 8.21Mb. But what about JPEGs? This is how they start to differ. Studio JPEG Files Are Often Smaller – Because of the Plain Backdropsīoth images are suitable for printing at high resolution at 14×11” they have the same number of pixels and the same uncompressed file size (data information). A camera producing this number of pixels for each image is known as a 14 Megapixel (or 14MP) camera, but each image would be 40 megabytes (40Mb) in size. A white pixel is still represented by the same number of bytes of data as any other colour. The reason they are the same is that they contain the same number of pixels and each pixel’s colour takes up 3 bytes of information (one byte – or 8 bits of binary information – for each value of Red, Green and Blue – RGB.).

#Image compression software reddit full

The other thing they have in common is that they both have the same full uncompressed file size of 39.7mb. This means that for every inch of print there are 300 pixels (this is the industry standard for photographic printing), resulting in the images containing 4200 x 3300 pixels (or nearly 14 million pixels). Both have been sized at 14 x11 inches 300 dpi. Image 2 is a location shot with a much more detailed background. Image 1 is a studio image containing a high proportion of uniform, white background. This post is going to take two identically sized family portrait images to highlight some common misconceptions.īoth of these family photos were taken with the same camera. There is sometimes confusion between image resolution and JPEG file size.