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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2
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2answers
114 views

Is there a programmatic Linux/Unix/Mac way to obtain the dimensions of a JPEG?

Inner Sanctum ~/mirror/images $ file wardrobe_square_90.gif wardrobe_square_90.gif: GIF image data, version 89a, 90 x 90 Inner Sanctum ~/mirror/images $ file wardrobe_square_90.jpg ...
15
votes
2answers
7k 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 ...
1
vote
1answer
617 views

What is “AppleMark”?

I have 2 JPEG files that appear the same, i.e. the same pixel data, same dimensions, but one of them is a much larger file size. The download time for these files is important to my client, so I need ...
3
votes
2answers
1k 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 ...
5
votes
2answers
2k 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 ...
0
votes
2answers
2k views

Convert JPG to Video for playback in VLC

Is this a quick/simple way to convert a bunch of JPG stills into some sort of video file so it can be played back in VLC? If the convertion can be done using VLC, that would be preferred.
8
votes
4answers
254k 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
0
votes
0answers
87 views

Using jpegtran with ffmpeg via piping?

I use ffmpeg to generate a ton of jpeg images. However, these jpegs aren't optimized by ffmpeg. On average, the images losslessly compress another 10-20% when I run them through jpegtran. I don't ...
0
votes
2answers
2k views

Convert PDF to JPG without Imagemagick

Is there a way to convert a common UTF-8 encoded PDF to a JPG without using ImageMagick or Ghostscript? The reason I'm asking is, that I have to replace or "simply" double layer a small part (date) ...
0
votes
2answers
1k views

H264 decompression/decomposition into JPG - quality issues

I'm trying to decode a 1920x1080 30fps h264 stream. Individual frames look outstanding in VLC media player (pausing the playback), but when I decode using avconv (ffmpeg has been deprecated and ...
5
votes
4answers
3k 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 ...
0
votes
2answers
348 views

JPEGs of the same resolution have different sizes

I have a collection of photos taken from my digital camera. All of them were taken with the same settings (same resolution etc...). However all these pictures have different file sizes. Why is this? ...
1
vote
1answer
1k views

How to merge an image into an audio file?

I am trying to merge a thumbnail-size (104x80) image into an audio file (M4A). I want it to be played in JW Player, but it doesn't seem to support thumbnails. I have tried it in VLC Player, but the ...
0
votes
0answers
27 views

Browser downloads jpgs, doesn't display them

My browsers (Chrome, IE both exhibit this behavior), when faced with an href link that points to a .jpg file, downloads it rather than displays it. I think perhaps something happened with file ...
1
vote
1answer
582 views

Any Open Source pdf to jpg or png converter? [duplicate]

I need open source engine that converts pdf files into jpeg or png files which I will feed in to ocr engine. Currently I am using PDFBox for this task, but while it does the job, it reports weird ...
7
votes
4answers
9k 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 ...
-1
votes
2answers
1k views

PNG file size is too big after converting from JPG

I try to convert a JPG file to PNG, but the size is still too big, about 7 MB. What's wrong? I used Microsoft Paint to convert it. The original file is only 500 KB in JPEG, yet the PNG file is 7 MB. ...
0
votes
1answer
197 views

Default file extension for picture downloads on Chrome?

My google chrome will only save pictures as KanKan (then there's some Chinese: 图秀 or something) How do I get it back to .jpeg as a default? (the drop-down menu only says "all files")
7
votes
3answers
6k 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 ...
0
votes
2answers
25k views

How to convert a 24 bit JPEG image into 8 bit image?

I have a 24-bit image. I need to convert it into an 8 bit JPEG image. Can it be done by MS Paint or MS picture manager or I need to download any tool. I tried some tool but that did not work. Will ...
4
votes
1answer
348 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 ...
3
votes
1answer
540 views

how to save an amazing jpeg from the evil grey squares

I just saved over a thousand pictures using the procedure described in this question. However, a few of the pictures have grey areas on them. the thumbnail displays the picture perfectly, but once ...
2
votes
1answer
4k views

FFMpeg convert jpeg images to video

I'm attempting to take a set of images taken at 1-second intervals to form a timelapse video. I figured this would be easy with ffmpeg, but i'm running into cryptic errors. All the images are yuv420 ...
2
votes
1answer
483 views

Why does saving a JPEG as PDF increase the filesize 7 times?

I have a JPEG of 440KB. When I open it in Preview on Mountain Lion and save it as a PDF the PDF is 2.8MB. The PDF version is 1.4 and the PDF producer is Mac OS X 10.8.2 Quartz PDFContext Why has the ...
2
votes
0answers
422 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 ...
28
votes
3answers
13k 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 ...
1
vote
0answers
67 views

How can I get my jpgs to display again? [closed]

Somehow jpgs on my photo blog sites* are no longer displaying FOR ME - they seem to still work the same as always for others. http://montereyscenics.posterous.com/ and ...
0
votes
1answer
5k views

View corrupted jpg files

What can I use to view\repair corrupted jpg files? I am trying to recover images from a corrupted SD card, and the tools I used gave me some images that I can't open. I have tried opening them with ...
1
vote
2answers
6k views

How to convert JPEG JFIF files to JPEG Exif format?

I recently put the SD card of my camera in a Windows 7 PC and start browsing pictures on it. I noticed some were not aligned correctly and use rotate feature included in Windows Photo Viewer in order ...
0
votes
2answers
1k views

convert serveral image files to a single djvu file

Suppose I have serveral BMP image file, say 001.bmp, 002.bmp,..., 100.bmp. I want to convert these files to a single djvu file, whose first page is the content of 001.bmp, the second page is the ...
1
vote
3answers
1k views

How to make multiple copies of the same image, but with different filenames?

Shortly, I'll be required to rename 22,000 .jpg files from imagereference.jpg to itemcode.jpg. The rename itself isn't a problem, the issue lies with several thousand of the images are currently ...
10
votes
6answers
17k 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. This has been bugging me on ...
1
vote
1answer
98 views

Most space-efficient format for image with large dimensions but few colors?

Recently I have had to scale up the dimensions of a gif image by a factor of 2, this resulted in an increase of the file size by about 8 times. While this is not a complete surprise, I can't help but ...
1
vote
3answers
224 views

Particular jpeg image does not preview in Nautilus and cannot be uploaded

I have a group of .jpg images from the same source that all seem to behave fine: I can open/edit them with eog/Kolourpaint/GIMP, their thumbnails load correctly in Nautilus, etc. However, when I try ...
1
vote
2answers
1k views

Google Chrome displays some gray jpgs with pink overlay

The problem appears on site http://ui-cloud.com/ and a lot of other. If I save the image from the site and open it in some image viewer app, then image displays correct. Also all other browsers in ...
4
votes
2answers
461 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 ...
2
votes
2answers
1k views

Kaspersky Internet Security corrupts chunked HTTP data

When I visit the web-page http://www.ol-in-berlin.de, the random image on the left (http://www.ol-in-berlin.de/module/startseite_bild.php) is not displayed correctly. It happens with Firefox 16 as ...
0
votes
1answer
667 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 ...
5
votes
1answer
551 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 ...
0
votes
3answers
7k 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 ...
3
votes
2answers
672 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 ...
1
vote
2answers
1k views

Printing JPG files with GIMP 2.8

I used to print my (with GIMP 2.6.11) modified images on my Canon Selphy CP780 printer without any problems. But now I use GIMP 2.8.2 and the modified and exported JPG files won't print anymore. ...
1
vote
0answers
552 views

ffmpeg extract I-Frames, GOP to jpeg sequence

This is kind of hard to explain, so bear with me. So I'm looking for some way to export video GOP frames to jpegs. I'd like to preserve the I-Frames, P-Frames, B-Frames, etc. So that the next frame ...
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 ...
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?
1
vote
0answers
464 views

A way to perform lossless JPG edits in Adobe Photoshop CS6?

I perform lots of small edits of JPGs daily on my computer, and was wondering whether there was a way to perform cropping and rotation without the loss of quality during recompression. I know there ...
2
votes
1answer
100 views

How do I find out what the file-type of an image is?

I have image that is not opening. However online convertors are able to convert it. How do I retrieve the image format? When opening file in text editor, the following information may be found: ...
0
votes
1answer
274 views

PDF to JPEG conversion algorithm

I was wondering how the snipping tool works while cropping any vector image, for example an image on pdf file, to jpeg file. Does it use rasterization? Is there any way to convert an image on a PDF ...
6
votes
3answers
39k 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
2answers
1k views

OS X says “the standard extension is” .jpeg, but according to whom?

When I attempt to save a file as "picture.jpg", OS X unhelpfully informs me that the standard extension is ".jpeg". I think the bazillion .jpg files on the web beg to differ, so where does Apple get ...