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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482 views

Append Script to an Image

I have a JPG image. I want to add/append a small piece of script(It can be of any language like PHP,Javascript,etc), but the image extension should not be changed. It must be jpg itself even after ...
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1answer
6k views

7-Zip: Unsupported Compression Method while trying to extract a zipx file that consists of JPEGs

A zipx file I received consists of .csv files and .jpeg files. I used 7-zip to extract them. While the .csv files were sucessfully extracted, the JPEG files didn't. The error was something like this ...
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0answers
19 views

Software to link up photos in a line to form one image

I have several (around 50) photos of multiple sections along a river, each with a metre stick in the photo for scale. I need a way to link these photos up in a single image, whilst being able to crop ...
74
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6answers
37k 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 ...
11
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2answers
946 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 ...
0
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2answers
1k views

How can I achieve the maximum zip compression? [closed]

I would like to make a "standard" zip file which contain .jpg images. Which software and switches / options should I use to achieve the maximum compression ratio? I mean maybe I can make a solid ...
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1answer
418 views

Why does ImageMagick's montage limit the JPG output to 65500 instead of 65535?

JPEG/JFIF supports a maximum image size of 65535×65535 pixels. Is there any reason why ImageMagick's montage limit the JPG output to 65500 instead of 65535?
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0answers
125 views

How to scan documents into Windows 8.1 as JPEG images?

I recently updated my computer from Windows 7 to Windows 8.1 and downloaded an up-to-date interface for my Brothers MFC-J825DW printer to accommodate scanning documents. Unfortunately, now when I ...
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1answer
605 views

How can I convert a large PDF to PNG?

I want to convert a very large PDF file (>2GB) to a PNG (or JPEG) file so that it is easier to open and look at. I want to do that without opening the PDF file since it is too large to be opened. Is ...
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1answer
2k views

How to convert PSD to JPG or PNG on Linux with Gimp CLI/batch mode (or other server-side tool)?

I've been working on a theoretically simple web service to convert PSD or AI files to jpeg, png or some web-compatible format. I was able to successfully use ImageMagic's convert -flatten sample.ai ...
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0answers
68 views

jpg repeating gif imagemagick

so this is my first post on Stack Overflow after years of being a read-only guy. This time i have hit a wall and can't really get past it and would really appreciate your positive response. This is ...
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2answers
788 views

Load file automatically on start up windows xp

I have a few text files that I want to see every time I turn on the computer, like Post-It notes. So basically as the title says, how can I configure Windows XP to load specific files on startup?
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1answer
1k views

Imagemagick killing colour quality when resizing image

I'm trying to resize a bunch (450+) of images through imagemagick, they all start at 500x500 and I've written a script to resize them to about 5 different sizes. Now I've converted them I notice that ...
0
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0answers
170 views

ffmpeg: converting jpeg image sequence to movie gets error “not enough frames to estimate rate consider increasing probesize” [closed]

I have an image sequence with a numbering system of: image-00001.jpg. I want to convert this to a movie using ffmpeg. I always get the error in the title no matter what I do. Below is the syntax I'm ...
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0answers
266 views

Image optimization: Photoshop CS6 vs jpegtran / OptiPNG

Is there any difference in terms of algorithm for optimization between Photoshop's Shift+Alt+S (save for web) and jpegtran's -optimize and -progressive? It seems my images are not reduced (or reduced ...
6
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3answers
3k 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 ...
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1answer
985 views

Apply jpegtran.exe to directory

I am trying to optimize a directory of images with jpegtran.exe but I can't figure out how to make it work. Does anyone have experience with this? I found this article about scripting jpegtran but ...
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1answer
779 views

How to remove string from JPEG files using find?

I have many files in many media catalogs with some string and I want to remove this string. The string is contained inside JPEG files and looks like: ...
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2answers
673 views

Watermark does not show in Windows Explorer

I have noticed that on certain photos with watermarks, the watermark will show in programs like Windows Photo Viewer and Paint but not in Windows Explorer. Here is an example photo and related ...
0
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1answer
617 views

Why does my image look sideways in thumbnail view but correct when I open it?

This is important because I will be submitting it for my visa application (rotated images disqualify you). The image looks rotated sideways in thumbnail view on my computer, but when I double-click ...
0
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1answer
728 views

creating an alpha channel for a jpeg image in paint.net

i'm using paint.net until I can afford photoshop elements. I notice that you can change the opacity slider in the layers menu opening 'properties', then it shows an image with the transparency ...
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1answer
2k views

The JPG file on my Open Office document is blurry when exported to PDF

I have tried both Open Office and Word, and the issue is the same. All looks fine until the document is exported to PDF, then the JPG image on the document becomes blurry. I hope someone can help.
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1answer
530 views

Software (for windows) to enhance scanned documents? [closed]

Is there any software for windows that can enhance scanned handwritten (black&white) documents (jpegs) for better readability. I am looking for a software that can do this automatically to a bulk ...
0
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1answer
987 views

Extracting jpeg images from mjpeg stream on terminal

I'm trying to extract jpeg images from an mjpeg stream. I've done a search and found a few sources, but those were extracting jpeg images from a mjpeg file, such as this one here. In my case, I don't ...
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2answers
121 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 ...
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2answers
14k 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 ...
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1answer
898 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 ...
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2answers
2k 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 ...
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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 ...
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2answers
6k 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.
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6answers
347k 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
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0answers
120 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
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2answers
3k 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
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2answers
2k 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
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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 ...
0
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2answers
714 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? ...
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1answer
2k 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 ...
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0answers
30 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
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1answer
791 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 ...
11
votes
6answers
16k 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 ...
0
votes
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
298 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")
10
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 ...
1
vote
2answers
51k 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
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1answer
495 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
695 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
552 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
567 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 ...
37
votes
5answers
22k 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 ...