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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11
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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 ...
1
vote
2answers
2k 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
342 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")
11
votes
3answers
11k 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 ...
1
vote
2answers
64k 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
532 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
774 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
5k 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
570 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
619 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 ...
40
votes
5answers
27k 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
70 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 http://iceagetrail.posterous....
0
votes
1answer
6k 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 ...
2
votes
2answers
9k 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
2k 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
2k 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 ...
16
votes
8answers
39k 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 ...
1
vote
1answer
106 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
260 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
532 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
1k 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 ...
6
votes
1answer
745 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
10k 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
1k 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
3answers
2k 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
690 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 ...
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 ...
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
664 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
126 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
399 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 ...
7
votes
3answers
71k 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 ...
2
votes
1answer
215 views

JPG compression setting for consumer-quality vacation photos?

When I'm saving a JPG file, Paint Shop Pro (Windows) and Gimp (Linux) show a pop-up to choose the JPG compression level. The apps have something like 85 as default value, and I think reducing the ...
9
votes
1answer
6k 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? ...
3
votes
2answers
1k 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 ...
2
votes
2answers
314 views

PC to Mac picture transfer not working, done through networking. Mac cannot see the photos

I have a Windows XP Pro desktop and a Mac laptop. I connected the laptop to the PC with an Ethernet cable. I then picked the folder I wanted to transfer over and I "shared" it. I then connected with ...
5
votes
4answers
1k 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 ...
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 ...
2
votes
1answer
3k views

Linux convert jpeg to bmp, xsetroot complains “bad bitmap format”, how to fix this?

I am creating a JPEG file, converting to BMP then using with xsetroot, but that is failing. 1) Make a JPEG file $ convert -size 800x600 xc:transparent \ -font Bookman-DemiItalic -pointsize ...
0
votes
3answers
6k views

How to batch-convert JPG files to uncompressed TIFF

I need to collect 1000 uncompressed TIFF files. I have a large set of JPG images, so I decided to convert them to TIFF format. The loss in quality is ok in this case for me. I used the following ...
2
votes
2answers
258 views

How to save a series of JPGs as an AVI at 30fps? [duplicate]

Possible Duplicate: How to turn images into a video slideshow with sound I have a series of JPGs that were from a video file. They are named according to their frame number. How can I put ...
7
votes
4answers
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
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, ...
0
votes
2answers
150 views

Photoshop issue saving image as lesser filesize then reopening and saving again

This is driving me absolutely mad. I save for web at 100%. I open back up. I save again at 100%. It is bigger than the last time. It keeps doing this over and over and over it could be infinite ...
0
votes
10answers
6k views

Reducing image size on Windows XP

I have a scanned JPG file and due to high quality scanning, the file size is large. What I would like to do is reduce the image size of the file, keeping the jpg format, but losing Quality obviously. ...
2
votes
2answers
17k views

What is the difference between progressive and optimized JPEGs in Photostop?

When saving a image for web and devices as JPEG, I can either choose “progressive” or “optimized” or “none.” What is the difference between both and what should I use? In my case, the image is the ...
0
votes
2answers
4k views

If I convert my file to PSD to JPEG, does it remember the width and height of the picture?

So I'm doing some card invites on my computer. I'm using photoshop, and I've got it with the height and width that I want to print it out. The only problem is, I'm going to have to take the file to a ...