PNG (portable network graphics) is a popular image format that supports 32-bit colors and transparency.

learn more… | top users | synonyms

-4
votes
0answers
26 views

How would I go about repairing this photo?

I have a few photos that appear to be corrupted slightly. Is there anyway to fix them? In particular this file is a PNG file. I have one attached that show what happened to them. ...
-2
votes
0answers
41 views

JPEG and PNG images through SFTP corrupts

When I upload a jpg or png image to my web server directory, the image is corrupting for some reason. I tried many images and they all are corrupted when uploaded. I can't view them on web browser or ...
0
votes
1answer
26 views

Create empty truecolor PNG with ImageMagick

How can I create an empty (transparent) PNG containing 24 bit color channels with ImageMagick? The obvious one convert -size 1920x1080 xc:transparent blank.png will create an 1bit b/w ...
1
vote
2answers
32 views

Comparing two images without fully downloading?

I want to download a copy of a big image file(+20MB) whenever it changes. But without downloading it every X seconds and comparing it with the old version i have, how would i know the image has ...
-1
votes
2answers
62 views

What kind of image compression causes this color banding? [closed]

I have two images. The first is before undergoing lossy compression: Picture #1: The second is after undergoing lossy compression: Can anyone explain to me what is going on here? How does this ...
0
votes
2answers
48 views

How to know the compression level of a PNG file and whether it is lossy?

Can I know whether a PNG file was compressed and how (at least, whether it was a lossless compression) in Windows? When I open the standard file properties dialog from the Windows Explorer, I see no ...
1
vote
1answer
376 views

FFmpeg - PNG / JPG - Invalid data found when processing input

I am trying to add a watermark to a video with FFmpeg. I have a custom build of FFmpeg that I am creating with a view to keep the binary size down. I seem to have excluded the ability for FFmpeg to ...
0
votes
2answers
72 views

Find out PNG transparent background color on Linux

It appears that PNG files contain background color information for transparent pixels. This sometimes becomes noticeable when using that image as a texture with wrong settings. How to find out in ...
2
votes
1answer
53 views

PNG or JPEG for an X-Ray without visible artifacts

A past paper question from a Multimedia Systems exam: If you had an X-Ray photograph of a leg which might be broken, which would give better compression before artifacts were visible, and which ...
0
votes
1answer
20 views

Substracting colors and extracting transparency values

Lets say a picture was made to semi-transparent and added on a flat background color. The original picture, background color and result(mixture) is known. But, that added transparency(alpha value) is ...
1
vote
1answer
77 views

Best way to convert BMP to PNG while maintaining quality?

Is this possible convert BMP to PNG while maintaining quality? I am trying to reduce the size of some albums that are in BMP, but still maintain the lossless quality. Just tried XnConvert and setting ...
0
votes
0answers
53 views

.png images load great - .jpg images are blurry on website

I've searched around and found lots of information about blurry images and I've implemented some of the fixes I found and it worked on about 50% of them. I'm posting Android apps and iOS apps - all ...
0
votes
2answers
50 views

ImageMagick's mogrify tool darkens PNGs (when only trying to resize)

I'm trying to use the simple command to resize images and overwrite the originals: mogrify -resize 80% * My source images are semi-transparent PNGs that happen to be grayscale. The resize operation ...
0
votes
2answers
217 views

Export excel chart to png with certain dimensions

How do i export an Excel chart to a PNG image, defining the exact size of the resulting image file? I need to export some excel charts to PNG to put them on a html page. Due to design restrictions, ...
1
vote
2answers
2k views

overlay transparent animation over video with ffmpeg

Overall task is to overlay animated infographics over video. What I would like as a result shown in this video http://www.youtube.com/watch?v=ZhMF3WD9pr0 Nice animated semi-transparent cyan line on ...
1
vote
0answers
448 views

What is @OpenWithToastLogo.png?

Background Recently, I copy-n-pasted some text from Notepad into a command line window. The copied text included a TAB character prefixing the text I copied, for example "{tab}test.exe". When I ...
0
votes
0answers
39 views

Use Windows rating system with pictures without metadata (PNG, BMP, GIF)

Windows as a native rating system which lets you rate pictures. The problem is that you can only rate JPG/JPEG pictures that contain metadata. You can't rate PNG, GIF and BMP pictures that don't ...
0
votes
0answers
202 views

avconv and ffmpeg: errors reading png files

I'm trying to use avconv to overlay data onto a video. I generate PNG files representing the overlay data at 4fps. The PNG files are the 120px wider and 60px taller than the original video, because ...
4
votes
0answers
211 views

LibreOffice has ugly PNG import [closed]

I'm trying to import a PNG graphic exported from Inkscape (I tried importing the SVG directly but it doesn't work: the text is missing and replaced by black boxes) in a LibreOffice document, but it ...
125
votes
6answers
15k views

How is PNG lossless given that it has a compression parameter?

PNG files are said to use lossless compression. However, whenever I am in an image editor, such as GIMP and try to save an image as a PNG file, it asks for the compression parameter, which ranges ...
1
vote
2answers
290 views

Convert PNG to Multi-page PDF

I've seen a lot of posts about how to convert a multi-page PDF to PNG but I'm wondering how I can go in the opposite direction if I have the size of each page I want made.
1
vote
1answer
18 views

I would like to batch change one colour in a group of PNGs. Mac - freeware software

I hope someone would be able to help me. I have a group of icons in png format. They are all transparent backgrounds with one colour for the actual icon. I would like to change this colour in all of ...
2
votes
1answer
6k views

how to remove a png file's background using paint.net

I have a png file that is composed of only two colors: white and dark. Majority of image space is occupied by the white color but I want to remove this white color, thus giving the image a transparent ...
0
votes
1answer
232 views

FFMPEG combine PNGs of different size into movie

Is it possible to combine PNG of different heights without rescaling (like tile does)? I have pairs of images of same width, but first has height 900px and second 200px. I would like them to merge ...
4
votes
0answers
2k views

correctly sizing PNG images in markdown with pandoc for html/pdf/docx

I am trying to use markdown with pandoc to convert a single document into html, pdf, and docx. It's an extremely simple document containing only math-less text and a few images. The images are in ...
1
vote
2answers
19 views

PNG file has different colours in different programs

I downloaded an icon from Icons8. With their tool I recolored it to dark blue (#2c3e50). After unpacking and uploading the 48px icon I got the following result: As you can see the color is not ...
1
vote
2answers
2k views

File Attributes - AI …Any clues?

Can anyone point me what does it mean when a .png file having 'AI' as File > Properties > Details > Attributes. Does it mean it made with Adobe Illustrator ? Also note that the png is 8bit image.
2
votes
1answer
245 views

PNG/BMP images become blurred on zoom

I recently installed a Debian Jessie desktop and when opening PNG/BMP images it all becomes blurred on zoom (in or out). With the image at 100%, everything looks sharp as expected. This happens both ...
3
votes
1answer
140 views

How can I explode an animated PNG?

Websites like GIF Explode allow you to "explode" an animated GIF into its component frames, and similar results are presumably easy to achieve with standard image-editing tools like GIMP, ImageMagick, ...
2
votes
2answers
202 views

How can I create an MNG file out of PNGs?

I am really struggling to find compatible software that will allow me to animate PNG files. The GIMP plugin crashes my GIMP. Nothing else supports it. Is there any way I can easily put together the ...
1
vote
1answer
862 views

Why are there no video formats that support transparency?

Why are there no [widely supported] video formats that support transparency? For example, the PNG image format supports transparency, allowing for some interesting effects in websites and documents. ...
2
votes
3answers
324 views

Do more compressed PNG images take longer to load?

When I create PNG files with very small disk size, I tend to wonder if the file size becomes less important than the time viewers would need to decompress the image. Technically that would be trivial ...
0
votes
1answer
415 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 ...
0
votes
1answer
133 views

Transparent regions of pasted png display as black in Inkscape

If I copy and paste, for instance, this image from Chromium or Opera webbrowsers into Inkscape, the regions which should be transparent are rendered as black, like so: How can I avoid this?
1
vote
0answers
43 views

ImageMagick: is there a way to get the same PNG from the same image on multiple platforms?

I have a script for converting game assets to multiple resolutions, via imagick, and when I run the same imagick commands on Mac and Windows (with the same version of imagick - ImageMagick 6.8.7-2), ...
0
votes
1answer
751 views

gnuplot not working on ubuntu

My initial problem is that i am unable to find png as list of terminals in set term. So using the link http://askubuntu.com/questions/393882/png-terminal-in-gnuplot, I installed the gd library.And ...
0
votes
1answer
286 views

Unable to plot png in gnuplot

i need to plot png files in gnuplot 4.6.3 and/or 4.6.4.I am unable to do so as set term does not list "png" as an option. system information is Linux masterx-Studio-1535 3.5.0-27-generic #46-Ubuntu ...
1
vote
1answer
383 views

How to make SVG in Inkscape really scalable?

I wanted to know how to make SVG from a raster picture in Inkscape. I am in Wikipedia which uses lot of SVG's so I want to make a few. I know how to track those PNG and export the bitmap results as ...
2
votes
0answers
1k views

Exporting high quality PNG from LibreOffice Draw

I need to generate a PNG file of an image composed in LibreOffice Draw. When I export to PNG directly, the quality is almost perfect, but it's just slightly blurry. However, when I export directly ...
1
vote
0answers
217 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 ...
0
votes
2answers
420 views

Fix Linux-made png file for use on Windows

There is a particular icon library that I really like from DeviantArt. Now, I have downloaded the package that has the png files inside (I know the ico files are there, but I want the png files). ...
6
votes
4answers
3k views

How to open huge PNG image [duplicate]

I have a really big PNG image, it's ~11GB. Is there any way to open it? I would just like to view it without too many problems. I tried Photoshop CS6 and it's too big even for this kind of modern ...
4
votes
4answers
4k views

How to change DPI of a PNG file? (in command line, without ImageMagick)

I am looking for a way to change the DPI on PNG image files. Using ImageMagick this is easy: $ convert -density 150 -units pixelsperinch file.png file.png The problem is that I will run this ...
5
votes
1answer
8k views

Using ffmpeg to make a movie from png files

I have 277 800x600 png files with filenames with the format island_sizes-CSH(II)-###.png where ### is a number starting with 084 and ending at 360. I'm doing ffmpeg -i island_sizes-CSH\(II\)-*.png ...
1
vote
2answers
509 views

How does this animated png work?

I've just received an email that contains a remotely hosted animated png. The png file is a countdown timer. Here is the URL:- https://img.kickdyn.com/57/1MfiOGVFjvmaMMHd3VZv/imgancnt.png Can ...
0
votes
1answer
152 views

Turn monotone background in transparent

On the internet, you usually get images, that originally were PNGs with aplha chanel and were pasted on white background. Is there some way to substract the white from the zones, where the ...
0
votes
4answers
284 views

Convert single PNG image into single PDF

I need a method to convert single images (specifically PNG format) into PDF's that are automatically re-sized to fit that single image (and not remain the default 8.5x11" letter size). I could do this ...
1
vote
2answers
330 views

Why do light edges appear on transparent PNGs online?

Everytime I try to use transparent PNG images on sites, white edges keep appearing around the images, seen in the photo below. How come this is happening, and how do I stop this from happening? ...
0
votes
3answers
1k views

Transparent texture rendered as black

I'm trying to render a scene with transparent png. The scene is actually imported from a .obj file (with another .mtl file), which should technically applies the transparency for me. ^ It does ...
0
votes
2answers
3k views

Mac get info always showing png icon instead of the icon

When I open 'Get Info' copy my icon over the default and it applies it but it never shows it. It only shows the default PNG icon (with the pictures and the camera). Does anybody faced the problem ...