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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49
votes
6answers
58k 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.
27
votes
8answers
28k 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 the main differences between the formats are.
22
votes
2answers
5k views

Meaningful thumbnails for a Video using FFmpeg

FFmpeg can capture images from videos that can be used as thumbnails to represent the video. Most common ways of doing that are captured in the FFmpeg Wiki. But, I don't want to pick random frames at ...
13
votes
3answers
796 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
4answers
12k views

How to batch combine JPEG's from folders into PDF's

I have a about 500 folders with images inside. Is there a way I could batch convert this so that I get .pdf files that contain all images inside as pages? EDIT: There should be 500 PDF's created, ...
12
votes
2answers
2k views

What is the largest size of a 640x480 JPEG?

I'm creating a data storage device that takes a certain number of pictures of the night sky over a couple of hours, and the pictures will be downloaded right after they are all taken. The memory card ...
11
votes
5answers
9k 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.
11
votes
5answers
7k 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
10k views

Is there any drawback to just renaming jpeg files to jpg?

A client sent me many jpeg files that I'd like to rename to jpg. Is this just a matter of renaming them, or should I open them with an image editing program and then saving them as jpg?
10
votes
6answers
16k 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 ...
10
votes
6answers
37k views

How to convert .jpg images to .eps?

How can I convert a .jpg image to an .eps?
9
votes
4answers
6k 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 ...
8
votes
2answers
20k views

Batch convert multiple PDF to Image on Mac

What would be the quickest way to convert a bunch of pdf files to jpeg files? I know I can open Preview and Save As image, but that could take a long time.
8
votes
5answers
2k views

OS X: How to perform a lossless crop of a JPEG image?

I'm looking for a simple way to losslessly crop JPEGs on OS X. Particularly, is there some way to get Preview to perform a lossless crop?
7
votes
2answers
494 views

can we change jpeg image size with out decoding and re-encoding

I want to convert 640x480 jpeg image to 320x240 jpeg image. I know it can be done by decoding the jpeg image into raw YCbCr, scale it and re-encode it into JPEG. But is it possible possible with JPEG ...
7
votes
3answers
8k 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 ...
7
votes
2answers
2k views

Progressive JPEG quality compare to normal JPEG?

I'm trying to convert some BMP files into JPEG format at highest quality (Q = 100) until I realize there is a "Progressive" option here. One of my BMP file is 2.9MB. After converting to JPEG format ...
6
votes
1answer
1k views

brew link jpeg issues

I am trying to install opencv on Mac OSX Lion. brew install opencv I get the following error (and a few other similar ones) Error: The linking step did not complete successfully The formula built, ...
6
votes
2answers
530 views

Re-saving JPEG while keeping quality

Sometimes I use XnView's* "batch conversion" tool to downsize a bunch of JPEGs (to maximum of 1600x1200). But some of them are equal or smaller than that and no resizing is done. Is any image quality ...
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?
5
votes
3answers
238 views

Arrange JPG images based on JPG compression/quality

I have been looking for a way to arrange JPG images based on the quality/compression level of the images. I want to do this so that I could select only those images which has less compression (let’s ...
4
votes
3answers
3k views

How do I batch convert thousands of NEFs to JPEGs?

I accidentally set my camera (a Nikon D70) to shoot in NEF only and not NEF+JPEG. Obviously, this will be a major pain when I want to go through them all. I don't envy having to wait for seconds at a ...
4
votes
2answers
4k views

A thousand JPEG images in a Word document: how can I format them in the same way?

Please suppose you have a Microsoft Word 2007 document: you have just inserted in it about a thousand of JPEG images. With the first image, you do right-click, then FORMAT PICTURE, then option ...
4
votes
5answers
1k views

Free converter for (multiple) JPEG to (single) PDF [duplicate]

Possible Duplicate: Free program / tool to convert multiple images into a single PDF Is there any free converter available which will convert multiple JPEG files and dump them in a single ...
4
votes
1answer
239 views

How to find all jpeg images of the same camera model

Recently during a installation messup , I lost all my files from my windows NTFS drives. I installed on testdata on Ubuntu 12.10 Desktop edition and with the help of photorec could recover a lot of ...
4
votes
2answers
373 views

Automating the choice between JPEG and PNG with a script

Choosing the right format to save your images in is crucial for preserving image quality and reducing artifacts. Different formats follow different compression methods and come with their own set of ...
4
votes
1answer
377 views

How do I achieve lossless JPEG joining without truncation of partial MCUs?

I am working on a project for which I need to join thousands of JPEG images losslessly (I'm not talking about the Lossless JPEG/JPEG 2000/JPEG-LS formats here). Aforementioned images have varying ...
4
votes
2answers
818 views

Getting N jpeg images from N-Pages PDF

I've a PDF composed by N pages. I want to convert this PDF in N jpeg images (by command line, no Php, Java or other programming languages). I'm trying to do this with GHOSTSCRIPT but the output ...
4
votes
7answers
6k 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?
4
votes
1answer
776 views

Repair broken jpg files

Hi I'm sure there were a lot of similar questions asked, but after searching a lot I didn't find any post describing my situation. I have some jpg files which have some colours wrong after a certain ...
4
votes
2answers
508 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 ...
4
votes
9answers
8k views

Stop Windows 8 from converting wallpapers to low quality JPGs

This has been bugging me on Windows 7 as well, and much to my chagrin Microsoft didn't bother addressing that issue in Windows 8. Take this image for example: (Click to open original unaltered ...
3
votes
3answers
35k views

how to change the dpi of an image

I have an jpeg file of 300 dpi. I need to reduce it to 200dpi. How can I do that? Do I need any specific application or it can be done using Picasa/paint/MS picture manager, if yes how? Thanks
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 ...
3
votes
3answers
20k views

How to split a mp4 video into jpg pictures? [duplicate]

I have a video(with 4 min) in mp4 format(probably MPEG-4) that I need to convert into a lot of pictures(jpg's). I would need to take a lot of Print Screen and paste on MS Paint to manually do that, ...
3
votes
4answers
572 views

Losslessly compressing similar images?

I need to reduce the size of my photo library so I naturally want to compress them. Many of them are not quite identical, but still very similar (subsequent shots of the same scene). Is there any ...
3
votes
1answer
2k views

Recursively resize images from one directory tree to another?

I have a large complex directory tree full of JPG images. I would like to create a second directory tree that exactly mirrors the first, but resizing all the images down to a set size (say 2000x1500 ...
3
votes
3answers
489 views

How to automatically rotate images based on EXIF data?

I know how to do it manually. Now I would like to automate that based on EXIF data. I already have exiftool installed, but looks like it can only read the data, but can not rotate the image. There is ...
3
votes
2answers
2k views

jpeg: reduce picture size without changing resolution and quality

I'm trying to reduce file size of a bunch of JPEG files, say 1280x720. Without changing the resolution and the visual quality much, what are the recommended approach?
3
votes
2answers
506 views

How to save duplicate images in Excel to different JPEGs

I have an Excel sheet with images which are stored as objects in one column and product names in another. I was trying to extract all the images to JPEG files. I was able to achieve this by saving the ...
3
votes
2answers
387 views

aview: Invalid magic-not p?m family format

I am simply trying to use aview to display a simple JPEG image using the terminal, however every time it returns this error: Invalid magic-not p?m family format It happens with other files of other ...
3
votes
1answer
10k views

Fixing damaged jpgs

Recently I stupidly deleted some photos I shouldn't have. I used a program to recover the photos, some of them came back in a corrupted condition like below with grey areas. Any idea on how to fix ...
3
votes
4answers
4k views

How to convert eps file to a large jpeg image

I am using Linux. I want to convert an eps file to jpeg file. I find that I can use "convert" command. However, the resulting image looks very small. I want to enlarge the jpeg file by -resize option. ...
3
votes
2answers
831 views

Gimp reports huge file size (in the GB range) when trying to export to JPG

If I load a JPG file (2-4 MB in size) into Gimp for photo manipulation and try to export it, Gimp reports the file size will be in the region of 1.3 GB! I have to export it as PNG, which results in a ...
3
votes
2answers
155 views

Which file format starts with 0xAD 0xE1?

A friend of mine has a collection of .jpg that cannot be opened because they start with 0xAD 0xE1 (so says GIMP). Any idea which file format these may be?
3
votes
1answer
35k views

How do I crop an image in the Mac version of Microsoft Word?

I know how to do it in the Windows version of Word but I can't work out how in the Mac version. In Windows there's a crop tool where you can just drag to move the edges in to crop the image, how do I ...
2
votes
4answers
12k views

How can multiple image TIFF files be converted to JPEG files?

How can multiple image TIFF files be converted to JPEG files in a batch manner? Update 1: convert on Linux (part of ImageMagick) as suggested by Miss Cellanie and glallen worked. It was ...
2
votes
3answers
2k views

Is there a way to find only progressive jpegs on Mac using Adobe CS or other apps?

To put my work up on my website, I initially collected some images and converted them to progressive jpegs. But later I went in and added more. I now can't tell simply by file size which ones are ...
2
votes
6answers
10k views

Decoding base64 images and saving to a file

I need to save a few base64 images from a web page to actual GIF and JPEG files on my hard drive. Is there a utility out there that can assist me? I've looked around and either I'm not seeing one or ...
2
votes
5answers
2k views

Software to convert JPG images into specific file size on disk?

Is there any (free?) software that will help me to convert existing JPG files into a specific file size on disk? (I assume that the software will estimate accurately compressed file size during the ...