Bulk convert PNG-24 to PNG-8 files with best quality

Posted by Gavin on Super User See other posts from Super User or by Gavin
Published on 2011-02-17T06:55:54Z Indexed on 2011/02/17 7:27 UTC
Read the original article Hit count: 762

Filed under:

png

|

imagemagick

|

bulk

|

image-conversion

|

image-transparency

Hi,

Can anybody recommend a good method of bulk converting a large amount of PNG-24 files to PNG-8 with as little loss of quality as possible and maintaining transparency?

I've tried ImageMagick but the resulting images weren't quite as crisp quality as I'd like. Using Paint.NET I was able to achieve far better results, but I can't bulk process with this tool as far as I know.

The settings I used with ImageMagick in case there's better options to use: convert file.png -depth 4 file-output.png

I've also been playing with OptiPNG, but I haven't discovered a was of making sure the output images are PNG-8.

Cheers, Gavin

© Super User or respective owner

Related posts about png

Bulk convert PNG-24 to PNG-8 files with best quality

as seen on Super User - Search for 'Super User'
Hi, Can anybody recommend a good method of bulk converting a large amount of PNG-24 files to PNG-8 with as little loss of quality as possible and maintaining transparency? I've tried ImageMagick but the resulting images weren't quite as crisp quality as I'd like. Using Paint.NET I was able to achieve… >>> More
Azure Mobile Services: what files does it consist of?

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
Azure Mobile Services is a platform that provides a small set of functionality consisting of authentication, custom data tables, custom API’s, scheduling scripts and push notifications to be used as the back-end of a mobile application or if you want, any application or web site. As described in my… >>> More
how to rename files with count

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
i have a directory like this: randomized_quad015.png randomized_quad030.png randomized_quad045.png randomized_quad060.png randomized_quad075.png randomized_quad090.png randomized_quad1005.png randomized_quad1020.png randomized_quad1035.png randomized_quad1050.png randomized_quad105.png randomized_quad1065… >>> More
How can I center XHTML content with CSS?

as seen on Stack Overflow - Search for 'Stack Overflow'
so I recently converted a website of mine from a table content format to a div content format. Table format Version: Table version of the website: here. Table version style CSS: body { width: 1020px; margin: 0 auto; background-image: url(images/bg.png); } .logo{ width:301px; … >>> More
Images in the project NOT adding to array - don't know why.

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi there, I have to sets of images. Each set has 16 images. One set is called 0.png through to 15.png the other is a0.png through to a15.png. In my app, it loads each one dependent on a variable (which by logging, I have proved it works) here is the code [MemoryManager sharedMemoryManager]; NSLog(@"THEME:… >>> More

Related posts about imagemagick

Can't seem to install imagick

as seen on Server Fault - Search for 'Server Fault'
I'm trying to install the PHP PEAR PECL extension "imagick" (image magick), but failing horribly. It seems that I keed installing packages to progress, but this one has me stumped. It seems to fail all the way at the bottom. Please Note: I'm using ArchLinux, apt-get doesn't save me. [root@Crux… >>> More
difference between compiled and installed via rpm (zypper)

as seen on Server Fault - Search for 'Server Fault'
In an openSUSE 11.1 I download, compile and install ImageMagick via: wget ftp://.../pub/graphics/ImageMagick/ImageMagick-6.7.7-0.zip unzip ImageMagick-6.7.7-0.zip cd ImageMagick-6.7.7-0 ./configure --prefix=/usr/local/ImageMagick make make install Everything works nicelly until I discover that… >>> More
ImageMagick failing to convert to JPG

as seen on Server Fault - Search for 'Server Fault'
Hi: We recently installed the latest version of ImageMagick onto our Linux server. I seem to be having issues performing the most basic of tasks. I am running this command line: /usr/bin/convert /location/to/source/design.ai /location/to/save/output.jpg Unfortunatly is saves design.jpg as an… >>> More
Install ImageMagick on linux shared hosting

as seen on Server Fault - Search for 'Server Fault'
Is the installation of ImageMagick library possible for a non-root user in a shared hosting environment? >>> More
Recent ImageMagick on CentOS 6.3

as seen on Server Fault - Search for 'Server Fault'
I'm having a terrible time trying to get a recent version of ImageMagick installed on a CentOS 6.3 x86_64 server. First, I downloaded the RPM from the ImageMagick site and tried to install it. That failed due to missing dependencies: error: Failed dependencies: libHalf.so.4()(64bit) is needed… >>> More