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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27
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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.
50
votes
6answers
59k 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.
22
votes
2answers
6k 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 ...
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 ...
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?
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 ...
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 ...
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.
7
votes
2answers
523 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 ...
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 ...
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 ...
1
vote
4answers
5k views

best freeware for doing batch conversion of jpg to png [closed]

Which is the best freeware for converting jpg files in different folder to png in a batch process on a windows xp?
3
votes
2answers
546 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 ...
2
votes
0answers
271 views

Append JPG to MPG Video ffmpeg/mencoder

I've found a lot of solutions for creating a video from a folder of jpgs, in this case a time lapse stream of photos from a camera. Thats easy, but seems to waste a lot of computing power ...
0
votes
1answer
432 views

Incomplete jpg or image files?

One of my tools didn't work properly and i have a lot of image files that isn't complete (50%, 70, it varies). What is a command line tool or lib (C++ or .NET, .NET preferred if not command line) to ...
0
votes
3answers
4k views

How to compress / reduce the size of JPEG photos for archiving? [closed]

I have 50,000 high resolution JPEG photos, where a couple of them might occasionally be needed, about once a year. I wanted to zip them to save disk space, except that zipping gives no space benefit ...
0
votes
1answer
2k views

Suggestions on how to repair corrupt files

( Warning, sample images are slightly NSFW; tattoo work shows a little bit of boob. ) Previously I had a Mac OS X sparse-bundle dmg and used DropBox on two computers. I would add to my secure ...
0
votes
1answer
6k views

How to convert MS word 2007 file into JPG file?

How to convert MS word 2007 file into JPG file? I need portable, freeware and off-line tool/method for Windows XP.