JPEG and layers

P
Posted By
Paul
Jul 28, 2007
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437
Replies
9
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Closed
I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

Thanks,

Paul.

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V
Voivod
Jul 28, 2007
On Sat, 28 Jul 2007 14:50:15 -0700, Paul
scribbled:

I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

JEPGs do not support have have layers.
G
Grinder
Jul 28, 2007
Paul wrote:
I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

If I recall correctly, JPEGs can have a thumbnail image stored with the file, in addition to the "real" image data. That might be what the Windows Explorer is displaying.
FS
Fat Sam
Jul 29, 2007
Paul wrote:
I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

Thanks,

Paul.

Surely it doesn’t mater what the thumbnail looks like, so long as the full size jpeg appears as you want it to.
The thumbnail is after all, only a windows related gimmick.
E
edjh
Jul 29, 2007
Paul wrote:
I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

Thanks,

Paul.
Look at the channels. There might be some image information in there you can use to recreate the original image. Unfortunately whatever you see is what is there. There’s no "underneath" or layers with jpg.


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S
SpaceGirl
Jul 29, 2007
Fat Sam wrote:

Surely it doesn’t mater what the thumbnail looks like, so long as the full size jpeg appears as you want it to.
The thumbnail is after all, only a windows related gimmick.

Um, image thumbnails in… and OSX, and Linux… oh and all Adobe products… and old Macromedia… iPods… my TV… my cellphone, even my printer. Some pretty much anything at all that deals with images. Some gimmick.

😀



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S
SpaceGirl
Jul 29, 2007
Paul wrote:
I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

Thanks,

Paul.

Thumbnails are generated (sometimes) when the file is saved initially. Sounds like in your case, the thumbnail was generated when the black borders were turned off (in PhotoShop, perhaps), but was never updated when the final image was saved with the borders turned on.

JPEG2000 supports some vector information in JPEG files, I think. Masks and basic vectors can sometimes be found buried inside the file, but it’s extremely unlikely.



x theSpaceGirl (miranda)

http://www.northleithmill.com

-.-

Kammy has a new home: http://www.bitesizedjapan.com
FS
Fat Sam
Jul 29, 2007
SpaceGirl wrote:
Fat Sam wrote:

Surely it doesn’t mater what the thumbnail looks like, so long as the full size jpeg appears as you want it to.
The thumbnail is after all, only a windows related gimmick.

Um, image thumbnails in… and OSX, and Linux… oh and all Adobe products… and old Macromedia… iPods… my TV… my cellphone, even my printer. Some pretty much anything at all that deals with images. Some gimmick.

Yeah, but what have the Romans ever done for us?

Okay, point taken, LOL.
R
Rob
Jul 29, 2007
Fat Sam wrote:

SpaceGirl wrote:

Fat Sam wrote:

Surely it doesn’t mater what the thumbnail looks like, so long as the full size jpeg appears as you want it to.
The thumbnail is after all, only a windows related gimmick.

Um, image thumbnails in… and OSX, and Linux… oh and all Adobe products… and old Macromedia… iPods… my TV… my cellphone, even my printer. Some pretty much anything at all that deals with images. Some gimmick.

Yeah, but what have the Romans ever done for us?

Built that wall to keep out the Barbarians.

Okay, point taken, LOL.

K
KatWoman
Jul 31, 2007
"Paul" wrote in message
I have a couple of jpeg files that have black rectangles obscuring some information that I now want to remove. When I view these files in windows explorer using the thumbnail view I can see what is under the rectangles but I cannot make out what it is as the image is too small. However, I have not been able to find a way of opening the jpeg so that I can see that information, the black rectangle always shows up.

Obviously the information is there so does anyone know how I can get it back again? i.e. remove the black rectangle

Thanks,

Paul.

just b/c the thumbnail looks good does not mean the file itself is good as someone posted the thumb may have been saved when the file was created if someone made a change to that file and saved it with black areas flattened into it the thumbnail may remain but the file is now saved with the black squares in it
JPG is not in layers so under is nothing

you may have a jpg 2000 format which may have layers of alpha channels if you are lucky
in that case you need a program that can see jpg 2000 and it’s layers or dl and add the plug in to Photoshop
then you may be able to shut off the masks and see under

I have seen files with partial images (not black squares though) created by incomplete downloads of the entire file
that will usually give a partial image at top and nothing below

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