TIFF vs. JPG


posted on 15th of august, 2010

Hi everyone!

I am wondering about the difference between TIFF and JPG. We all load up JPGs to Dreamstime and the downloadable TIFFs were generated from these uploaded JPGs by Dreamstime. What I do not understand is how it comes that TIFFs have more pixels than the underlaying maximum format JPGs, for example

JPG: 3944x3042px
TIF: 5091x3927px




















or

JPG: 4288x2848px
TIF: 6064x4028px























Is there anyone who can explain that to me?

Comments (2)

Posted by Fotodesignjegg on August 15, 2010
Dear Cristalloid,

first of all in general it makes no sense to transform a jpg file into a .tiff file, because the .jpg file format is a format where image information is lost.

The .tiff is a lossless image format.

If the .tiff version has a higher resolution, than your original .jpg file was enlarged. There are also some other agencies which are doing that, so it is, let me say a little common, but not all agencies are doing it.

The only logical reason for saving the enlarged .jpg files as as .tiff files is, to stop the loss of image quality by using twice the .jpg compression algorithm.

I hope this was helpful for you.
Bye
Roger
Posted by Bradcalkins on August 15, 2010
See comments from the admins in this thread: thread on TIFFs

They are upsized from the JPGs.



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