JPEG is a lossy-compression method for a digital image. The images can end up in many JPEG image containers (JPEG, JPG, JIF, JPE, JFI, JFIF) depending on the parameters surrounding the compression of the image data. JPEG is actually an acronym for Joint Photographic Experts Group, the group that ...

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75
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7answers
80k views

Batch converting PNG to JPG in linux

Does anyone know a good way to batch-convert a bunch of PNGs into JPGs in linux? (I'm using Ubuntu). A png2jpg binary that I could just drop into a shell script would be ideal.
0
votes
2answers
2k views

Can't access JPG, nor copy, nor open, nor change permissions

A few JPGs are giving me some grief. Viewing in File Explorer I can see the picture (in the thumbnail but not in "preview"). However, I can't do anything with it. I cannot open it in any program, I ...
2
votes
2answers
2k views

Automatic Edit Photoshop Canvas Dimensions in Bulk

On a website that I maintain I am required to edit hundreds of images to have a certain canvas size. The images come in all different shapes and sizes. I am trying to figure out a way to automatically ...
12
votes
5answers
8k views

How can one bulk time-shift the creation date of JPG images? (OS X)

I have an unfortunate situation following a vacation. The gist is this: 2 cameras, with Camera #1's clock being two days ahead of Camera #2. Therefore, in (Insert Photo Management Application Here), ...
10
votes
4answers
8k views

How to find the JPG quality?

When I save a JPG file with GIMP, I can adjust the quality I save it at, from 0-100 (I use 89). It seems like I've used an app to see what this number was on saved file but if I did I can't for the ...
3
votes
4answers
5k views

IE 8 likes to save photos as BMP when the photo is JPG. How to solve this?

When I use FF or Chrome to look at photos on Facebook, and save the photos to the hard drive, the photos will be saved as JPG, which is what the photo is originally. But once in a while when IE 8 is ...
15
votes
3answers
908 views

Is there still any reason to prefer GIF over PNG when creating images for web pages? [closed]

Long ago, I used to avoid the PNG image format when building web pages because browser support was lacking. I remember having a PNG on a page could cause the QuickTime plugin to be loaded - yuck. ...
12
votes
6answers
19k views

Editing JPEG EXIF properties

How can I edit EXIF properties of JPEG files on a Windows machine? Some image editing utilities handle the Rotation property wrong, which leaves me needing to make manual edits after rotating images ...
5
votes
1answer
5k views

Ubuntu 8.04: convert PDF document to one JPG per page

I want to convert a PDF document that spans multiple pages to 1 JPG per page. How can I do that?
30
votes
8answers
44k views

JPEG vs PNG vs BMP vs GIF

I would like to know which one of these formats requires less memory for the same quality of the picture, and what are the main differences between these formats.
4
votes
2answers
549 views

Image Classification - Detecting an image is cartoon-like

I have a large amount of jpeg thumbnail images ranging in size from 120x90 to 320x240 and I would like to classify them as either Real Life-like or Cartoon-like. Are there any applications that will ...
-1
votes
5answers
4k views

JPGs become zero-byte images

I had a few files in my computer that became zero bytes files automatically. When I try to open the files, it says invalid pics. How can I retrieve these images?
5
votes
7answers
8k views

convert jpg images into a video

I have a bunch of jpg images i want to turn into a video, i have tried JPGVideo but it did not work. any recommendations?
2
votes
4answers
3k views

Tool for compressing data in JPEG lossless format [closed]

I have a file which contains raw pixel data and I want to compress this data using JPEG lossless compression. I tried to search for this tool using google but couldn't fina any. Does anybody know here ...
1
vote
4answers
5k views

How can I preview j2k images in Windows 7 explorer

I have Windows 7 and I have some image files with the ending .j2k on my computer. These are jpg2000 images. Unfortuantely Windows 7 doesn't offer a preview of the actual image in the Explorer ...
14
votes
5answers
13k views

Convert a bunch of BMP files to JPEG on Linux

Someone sent me a bunch of BMP files and I need them in JPEG. I could convert them one by one using GIMP, but I'd rather do it all in one go. I have Ubuntu.
1
vote
4answers
351 views

Scanned JPEGs are large and slow to load - can they be optimized losslessly?

I have hundreds of JPEG photographs which were scanned about 5 years ago from negative using a Konica Minolta DiMAGE Scan Dual IV. The dimensions are ~4500x3000, and the filesize is around 12Mb, ...
7
votes
3answers
10k views

How can I make Windows Paint save by default as JPEG format?

Every time I want to save an image I've pasted into the Paint application, it chooses a BMP/DIB format (which is the worst for saving things from the clipboard). How can I hack Paint into defaulting ...