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Questions tagged [image-compression]

The objective of image compression is to reduce irrelevance and redundancy of the image data in order to be able to store or transmit data in an efficient form. Image compression may be lossy or lossless.

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opencv 2.4.5 unable to load tif image file properly in windows

I have few tif images which open on imread or cvLoadImage gives null data in windows whereas the same file is processed conveniently on ubuntu installation. Running imagemagik identify returns $identify 60018969.tif 60018969.tif[0] TIFF 1696x2192…
Puneet
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How do I compress imported images?

I've recently imported blog posts from blogger to a wordpress site. Google page speed is telling me these images should be losslessly compressed. How do I go about compressing these images if they weren't uploaded by me? I have 1000+ of these images…
UzumakiDev
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Trick browsers to render low-res images at larger sizes

I am working on a mobile web accelerator proxy server that aims to reduce bandwidth usage for mobile clients. Currently I am looking at image files. The most fail safe way of reducing file size is to use higher compression/lower quality, while…
frodeborli
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Is it conceivable to use a mobile device's GPU to accelerate runtime image compression?

I'm not necessarily looking for an immediate practical solution, but was curious as to whether the state of the art has been taken to practical limits. I understand low level GPU programming is a black art only a few have mastered and was curious if…
user3232559
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Image compression is not working

I have an operation on the site that takes crops an image, however the resultant, cropped image is coming out significantly larger in terms of file size (original is 24k and the cropped image is like 650k). So I found that I need to apply some…
Sinaesthetic
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Image Uploading with thumbnails original ratio in ASP.NET

I want to upload jpg file with asp fileupload. When I choose a jpg file first it will upload it doing nothing as same as in my computer. Second one it will reduce image for thumbnail which width is 250px and auto height with original ratio. And…
user3193906
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Larger image size in outdoor lighting for H.264

I recently did an experiment where I recorded H.264 compressed video on a Samsung Galaxy Nexus running Android 4.1 under different lighting conditions--office lighting, dim lighting, and bright outdoor lighting. For a 4Mbps bitrate encoding, the…
t2k32316
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Creating a compression loop using Python Imaging Library?

I'm attempting to write a program that will take an image file I input, save a new compressed version at 50% its original quality, then open the new file and run again n number of times. Essentially I need it to be a huge compression feedback loop…
user3023883
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Ways to optimize Monogame Windows Phone 8 project

Heey, We are currently busy with porting our game to Windows Phone 8 and other platforms but we walked into an issue. We created it on Windows 8 targeting Full HD with our assets and are now porting it to WP8 focussing 720p. But the issue is the…
MrME
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MATLAB- Matrix dimensions must agree

I have written image compression code as per my professor's explanation. It works fine but for some images it show the following error: **Error using + Matrix dimensions must agree. Error in idwt2 (line 90) x =…
Premnath D
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Optimize images in htaccess?

I am trying to reduce the imagesize of the webpage www.chevereganga.com by using this code in the htaccess-file. How does it work ? SetOutputFilter…
Chevereganga
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Can more or less compression be applied to different sections of an image?

I want to use this picture as the background of my website Right now it is at 1040 x 660 and using JPEG compression at 70%. This seems to be same technique that Twitter is using for their homepage when you visit it signed out. This technique has…
jophde
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Java JPEG Compression increases file size

I have written a method that should compress a JPEG image using the ImageIO lib from Java. However, when I attempt to compress some images, their size actually increases! (from approx 21 kb to 36 kb). Any idea why this is happening? My code is shown…
danvdende
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Basic Image Compression: Error "Index exceeds matrix dimensions" in MATLAB

I am doing a basic image compression. I want to take 8x8 window in an image and further subdivide that window into 2x2 and then have to find their mean values. After doing this, I have to compare this mean value matrix with a threshold mean(mean…
Premnath D
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optimize thumbnailed png files with imagick

I use below code for create a thumbnail of images but when I use png transparent background after thumbnail, result is very bigger (by data size) than original file. and imagick optimization didnot work good. and I tried all answers in all websites…
Nasser Ghiasi
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