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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2answers
79 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 ...
-1
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0answers
22 views
Créate a JFIF header for jpeg DATA compressed (AC DC coefficients) [closed]
i créate an algorithme for jpeg compression for color image with language MATLAB,
i used tables (for groupe jpeg) to code DC and AC elements, finally i have 6 binary vectors
vect_dc_r,
vect_dc_v,
...
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1answer
46 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? ...
0
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1answer
132 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
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0answers
19 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 ...
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1answer
79 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 ...
1
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3answers
81 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 ...
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2answers
121 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
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0answers
37 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")
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2answers
87 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
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1answer
402 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 ...
3
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1answer
59 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 ...
2
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1answer
92 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 ...
1
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1answer
325 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 ...
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0answers
16 views
Filename issues
Server is ubuntu 10.04 with apache installed. I have a file named picture.png and a file named picture.jpg. If I enter in the address bar www.mysite.com/picture, the png show up, but if I enter ...
2
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1answer
127 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 ...
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0answers
64 views
Corel Draw converting JPEG format files automatically
My digital camera takes photos in jpeg format (& RAW).
I recently found some old software discs for Corel Draw 6 & loaded them onto my laptop (running under Windows7). Now all my photos when ...
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0answers
92 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 ...
7
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1answer
693 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 ...
0
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0answers
32 views
How to scan a monochrome batch of documents that has one colour or grayscale page in between?
We scan thousands of batches a day (a batch is a set of related documents). A batch is scanned to a multi-page TIFF image(monochrome).
One of the documents in a batch may be a ID document, which is ...
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0answers
51 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 ...
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1answer
498 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 ...
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1answer
769 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 ...
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1answer
91 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 ...
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3answers
205 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 ...
3
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4answers
2k 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 ...
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1answer
65 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
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3answers
83 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
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2answers
315 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
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2answers
270 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
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2answers
771 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 ...
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1answer
139 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 ...
4
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1answer
188 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
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2answers
2k views
How to compress / reduce the size of JPEG photos for archiving?
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
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2answers
141 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 ...
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1answer
221 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. ...
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0answers
293 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
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2answers
547 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
717 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
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0answers
254 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
67 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
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1answer
140 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 ...
0
votes
1answer
5k views
How to split a mp4 video into jpg pictures?
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, ...
0
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0answers
322 views
Convert jpeg to H264 stream on Android
I'm trying to use libx264 and/or ffmpeg to encode a bunch of jpeg images to an H264 stream so I can send it from my Android to a server.
Can anyone tell me what are the methods I need to use in order ...
2
votes
2answers
404 views
OS X says “they standard extension is” .jpeg, but according to who?
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
74 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 ...
0
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4answers
208 views
Convert PDF to Full JPG Image
I have a PDF that I would like to convert to a quality JPG but don't want to get spyware on my PC with all these 'free' programs. Anyone have experience with this ?
1
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1answer
98 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
622 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
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2answers
166 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 ...
