Dreamstime

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?

Tags: differences jpg measurement pixels tiff

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.

This article has been read 955 times.

Continuous improving image quality

posted on 29th of august, 2010

>Generally spoken with every new generation of (digital) cameras there is an improvement of technical image quality (better colours, less noise and other artifacts etc.):
From my point of view in this context after some time it makes sense to shoot the same motifs again with better gear and upload these new images because our customers want (in most cases, if not all) the best quality. On the other hand the consequence of this is, that our customers will find nearly the same image several times in the data bank what makes it difficult for them to decide what image to take. And: at some point reviewers will refuse new images even if they are much better technically than the existing ones with the words "We have too many similar images already. Please perform a search on the subject before uploading, to...

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Tags: continuous expiry image improving quality

Comments (3)

	Posted by Frui on August 30, 2010 Expiration date seems to be not so clear becouse some people might, as before, upload photos taken with older cameras, and their works might still comply with conditions of minimal quality. Maybe try to add in background silhouette of lizard or frog, you will gain more unique look? :-)
	Posted by Cristalloid on August 29, 2010 Hello Heywoody, I think that the approach you named isn't really practicable because in a data bank of more than 9000000 images EVERY motif is covered more than good...
	Posted by Heywoody on August 29, 2010 I agree it's valid especially if replacing an older, inferior version. However, a better approach might be to do new stuff that is not so well covered ;-)