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

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27
votes
8answers
28k views

JPEG vs PNG vs BMP vs GIF

I would like to know which one of these formats requires less memory for the same quality of the picture, and what the main differences between the formats are.
49
votes
6answers
58k views

Batch converting PNG to JPG in linux

Does anyone know a good way to batch-convert a bunch of PNGs into JPGs in linux? (I'm using Ubuntu). A png2jpg binary that I could just drop into a shell script would be ideal.
26
votes
4answers
17k views

How do I convert an SVG to a PDF on Linux

How do I convert and SVG (containing a a few words of latin text and some simple vector graphics) to a PDF on Linux? I tried Inkscape 0.47 on Ubuntu Lucid, but it moves some sub-graphics randomly, ...
7
votes
3answers
3k views

Why are PNG-8 files mangled when opened in Photoshop?

Why are some 32 bit PNGs opened in Photoshop with Indexed Colors and no transparency? For instance, I grabbed a png icon file of the Stack Overflow logo at: ...
9
votes
3answers
12k views

How to convert a multi-page PDF file to PNG files, with one PNG file per page of the PDF document (Windows)

Is there a software that could convert a multi-page PDF file to PNG files, and could automatically save one PNG file per page of the PDF document (for Windows 7)? I have tried a few virtual printer ...
16
votes
3answers
3k views

Is it possible to store arbitrary data in an image file?

Is it possible to store arbitrary data such as documents or a program in the form of an image file, such as a PNG image? My concern is that someone could encode data for use by malware into an image ...
11
votes
5answers
4k views

How can I find out if a PNG file is 24 bit color or 32 bit color on Mac OS X?

I have PNG image files on Mac OS X. How can I find out if an image is 24 bit color or 32 bit color?
3
votes
2answers
691 views

How to quickly view huge PNG images in OS X?

I need to view and zoom into selected parts of PNG images around 10,000x10,000px, ~10MB. When I open these images with Preview, it takes over a minute to load and then is very slow to show the image ...
2
votes
2answers
197 views

Corrupt PNG files after unzipping

I downloaded 7-zip for Windows to extract .png files from .deb archives, but they turn out corrupted, showing a black background instead. Is there an alternative, working program for unzipping .deb ...
2
votes
5answers
349 views

Mass rescaling of PNGs

I have a bunch of PNG files that I want to rescale. Oversimplifying a little, let's say I have files named: apple@2x.png orange@2x.png pear@2x.png and so on, and I want to make: apple.png ...
532
votes
5answers
68k views

Why does this PNG image display differently in Chrome & Firefox than in Safari and IE?

Check this image out: On Chrome and Firefox it will show as a pear. Now, try to save it and look at it saved on your desktop. Also, try viewing in Safari or Internet Explorer. It will display ...
37
votes
8answers
35k views

How to convert a PDF document to PNG?

Looking for a free way to convert a PDF document to an image.
10
votes
2answers
8k views

How to create an uncompressed AVI from a series of 1000's of PNG images using FFMPEG

How can I create an uncompressed AVI from a series of 1000's of PNG images using FFMPEG? I used this command to convert an input.avi file to a series of PNG frames: ffmpeg -y -i input.avi -an ...
3
votes
4answers
4k views

How do I convert a .PNG into a .ICO?

There's an image in the VS2010 stock icon pack which is only included as a PNG, which I would like to use as an ICO (I want XP and earlier users to see the icon). How can I convert the PNG into the ...
2
votes
1answer
305 views

Why are colors changed in the preview for my clip on YouTube?

I have 1000 PNGs created with R and ggplot2. This is one for example: image000.png Now I use ffmpeg to glue them together into a clip: ffmpeg -r 10 -i image%03d.png -s 1380x720 -vcodec png ...
1
vote
4answers
5k views

best freeware for doing batch conversion of jpg to png [closed]

Which is the best freeware for converting jpg files in different folder to png in a batch process on a windows xp?
2
votes
4answers
7k views

Get pixel dimensions of a PNG on my Mac?

I have a random .PNG file on my Mac. Actually I have about a hundred of them. What is the easiest way to get the pixel dimensions? (I.e, 100 pixels wide and 50 high, or whatever).
0
votes
2answers
327 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

Can I export a PNG image from Word? [duplicate]

Possible Duplicate: Copy Image Out Of Microsoft Word Someone sent me a doc file with a picture in it. Probably it is a png. I want to save the picture in order to paste it to other ...
0
votes
1answer
1k views

How to use .png icons in Windows 7?

I'm pretty sure I you can't do that directly, but maybe there is a workaround which I am not aware of? But, if nothing else, someone points to the good png-to-ico batch converter, well, so be it, ...