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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96
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8answers
113k 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.
75
votes
6answers
41k views

Opened a JPG picture with notepad, pasted all the “text” to a new notepad file, changed to .JPG and it no longer opens. Why?

This phenomenon has been leaving me questions to ask. Here is the detailed experiment, my OS is Windows 7 x64 SP1: I changed a picture (JPG) file to TXT by simply changing its extension (or one ...
40
votes
5answers
26k 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 ...
39
votes
1answer
4k views

Search for a JPG on my computer by using a smaller JPG?

I have a low resolution image that I know I have the full resolution image stored somewhere on my computer. Is there anyway to search for a JPG on my computer by using a small resolution of an image ...
33
votes
8answers
71k views

JPEG vs PNG vs BMP vs GIF vs SVG

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.
19
votes
5answers
18k 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.
18
votes
2answers
17k 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 ...
16
votes
4answers
21k 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, ...
16
votes
8answers
38k views

Stop Windows 8 from converting wallpapers to low quality JPGs

Hello, visitor from the future! If you landed here because you're as annoyed as I am, consider voting for this thingy on Microsoft's Uservoice page for Windows 10. Turns out that Microsoft truly ...
15
votes
3answers
1k 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. ...
13
votes
5answers
11k 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), ...
13
votes
6answers
25k 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 ...
12
votes
6answers
53k views

How to convert .jpg images to .eps?

How can I convert a .jpg image to an .eps?
11
votes
6answers
19k 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 ...
11
votes
3answers
10k views

How to convert GIF files to PNG or JPEG in OS X with command line?

I have 10k+ GIF files that I need to convert to PNG or JPEG preferably using command line so that I can automate it. I'm not worried about losing quality or transparency, just need to prepare files ...
11
votes
2answers
1k views

Can we change size of an JPEG image with out decoding and re-encoding it?

I want to convert a 640x480 JPEG image to 320x240. 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 encoding ...
10
votes
5answers
9k 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 ...
10
votes
4answers
21k 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
5answers
3k 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?
9
votes
2answers
24k 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.
9
votes
1answer
5k views

How can I modify the EXIF orientation tag of an image?

I want to change the EXIF orientation tag in my JPEG images but without actual rotating of them. I want to do this to use them as a test case for an application I made. How I can do that in Linux? ...
9
votes
2answers
593 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 ...
8
votes
2answers
3k 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 ...
7
votes
6answers
379k 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
7
votes
3answers
12k 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 ...
6
votes
3answers
69k 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, ...
6
votes
3answers
4k 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 ...
6
votes
2answers
7k views

Fastest JPEG thumbnail generator for Linux

I'm looking for the fastest command-line image converter for Linux which can read a JPEG image, scale it down to at most 1366x768, and write a quality 50 JPEG image. Something like this, but much ...
6
votes
3answers
7k views

How to convert a photo to a black and white image by ImageMagick?

How can I convert a JPEG photo to black and white (not grayscale) image like output of a FAX scanner, by ImageMagick?
6
votes
7answers
13k 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?
6
votes
1answer
729 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 ...
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, ...
5
votes
4answers
4k 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 ...
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
4answers
997 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 ...
5
votes
5answers
3k 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 ...
5
votes
3answers
25k views

Which is the best utility for opening .jpeg, .png and .tiff files on Linux? [closed]

Which is the most commonly used utility?
5
votes
3answers
273 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 ...
5
votes
1answer
22 views

Add date watermark to jpg images

I am attempting to add a watermark to images that contains the date. I am not having any trouble putting text on images but as soon as I try and put a date I get unpredicted results. convert ...
5
votes
2answers
3k 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
4answers
17k 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 ...
4
votes
3answers
1k views

Does the JPEG file format support RGB data?

I am doing some programming that involves encoding image data using WIC. I used RGB data but WIC always treats it as BGR. I have a related question on Stack Overflow dealing with the programming ...
4
votes
2answers
5k 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
1answer
3k 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 ...
4
votes
1answer
526 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
4answers
5k 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. ...
4
votes
1answer
112 views

How can I tell if a JPEG was saved as Progressive?

I received a set of photographs from a photographer and need to confirm that the JPEGs were not saved as Progressive JPEGs. I have Adobe Bridge and Photoshop -- how do I check this?
4
votes
2answers
529 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
2answers
1k 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
2answers
641 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 ...