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Thread started 29 Aug 2010 (Sunday) 17:00
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little image in the corner of TIFs in Gimp

 
ncjohn
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Aug 29, 2010 17:00 |  #1

Hello folks.
When I save a TIF file in DPP and then open it in Gimp, there's a little duplicate image in the upper-left corner of the main image. It has its own layer. I don't see it in DPP or in PS Elements.
What is it?
Thanks




  
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tonylong
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Aug 29, 2010 17:49 |  #2

Could it be an icon for something in Gimp? A lot of programs use little icons over a thumbnail or whatever. If you "hover" your mouse pointer over it, does any "tip" pop up?


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ncjohn
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Aug 29, 2010 20:48 as a reply to  @ tonylong's post |  #3

No, no popups.:)
It's a tiny version of the picture I'm working on. I think it has something to do with a jpeg imbedded in the tif, but I don't know what that's for.
When you save files in DPP, you actually have the option to save as Jpeg, tif, or jpeg+tif, but I don't choose the jpeg+tif option because I don't see the point of it. But when I open the file in Gimp, the little picture is still there in the corner. (Since it's in its own layer, I just delete the layer.)
I can't find anything in the Gimp docs or the DPP docs about it, but I was hoping some Gimp expert could fill me in.
Thanks




  
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tonylong
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Aug 29, 2010 21:37 |  #4

Interesting -- I have no idea 'cause I've never tried that option -- I wonder...?


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tzalman
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Aug 30, 2010 04:03 |  #5

I've never used Gimp but I do know that every tif has at least one embedded jpg thumbnail, and sometimes more than one. Its purpose is that when viewing images in a photo browser the application does not have to open the full tif, which can be very large, and then downsize it to make a thumbnail - there is already one there and waiting. But I'm very surprised that Gimp is displaying the thumbnail as you describe. It is usually something that only geeks know about and, together with a lot of other metadata hidden in the file, normal people never dreamed of.

BTW, the tif + jpg option in DPP produces two separate fullsized files.


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ncjohn
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Aug 30, 2010 12:06 as a reply to  @ tzalman's post |  #6

It sounds like my removing that layer will make my TIFs smaller and, since I haven't noticed any problems from doing that, I'll continue to do it.
Thanks for the info, it's always good to know what's going on.




  
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Lowner
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Aug 31, 2010 14:41 as a reply to  @ ncjohn's post |  #7

I have also wondered what the little no.1 and the envelope in the top left indicate when I open images in Photoshop. Its common to jpegs, psds and tiffs.

Heres a corner crop to show what I mean.


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ncjohn
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Aug 31, 2010 20:10 |  #8

Lowner wrote in post #10824353 (external link)
I have also wondered what the little no.1 and the envelope in the top left indicate when I open images in Photoshop. Its common to jpegs, psds and tiffs.

Heres a corner crop to show what I mean.

At the cost of PS, seems like they would have the most extensive manual in the world. Doesn't say anything about that, huh? Whatever it is, it doesn't show up in PS Elements.




  
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HankScorpio
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Sep 01, 2010 14:01 |  #9

Lowner wrote in post #10824353 (external link)
I have also wondered what the little no.1 and the envelope in the top left indicate when I open images in Photoshop. Its common to jpegs, psds and tiffs.

Heres a corner crop to show what I mean.

It's a slice. No clue why you have one around the whole image though.


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Lowner
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Sep 01, 2010 15:10 as a reply to  @ HankScorpio's post |  #10

Hank,

Slice?


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HankScorpio
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Sep 01, 2010 15:19 |  #11

Photoshop has a slice tool for cutting images into web friendly pieces so you can assign links to several parts of one image. It's a bit outdated since CSS was invented but when you create a slice, PS numbers it and displays the envelope thing top left of the slice.

Again, no clue why you have one as I'm sure you have to deliberately do it.


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Lowner
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Sep 01, 2010 15:22 |  #12

Hank,

Thanks for the explanation. It's on every image I ever open in Photoshop which as you say is very odd.


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little image in the corner of TIFs in Gimp
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