Posts Tagged imagecreate
XKCD Colour Survey – a 3D visualisation
Posted by Howard Yeend in javascript, machine learning on May 4, 2010
Randall Munroe (of XKCD) has been running a “name the colour” survey for the last few months and today released the data. The results are broken down by gender, and he makes some fascinating obvservations.
I’ve been working on a colour-related project on and off for about a year now, and part of that has involved creating visualisations of the RGB colour space – plotting red on the X axis, blue on Y, green on Z. So I thought it would be interesting to map XKCD’s 954 most common colour names in three dimensions – his charts are nice n’ all, but sexy javascript 3d is, well, sexier:
If you click that, you’ll be taken to the demo page, where you can interact with the cube. It’s a bit juddery, working entirely with divs and DOM manipulation, rather than canvas. Here’s a view from the side angle that shows off the “3d-ness” a bit more:
Of course, a canvas is really a better solution, so here’s a version that renders onto canvas, which is much much faster, but currently omits the names:
allRGB Entry – PHP Image Manipulation
Posted by Howard Yeend in PHP on February 10, 2010
The objective of allRGB is simple: To create images with one pixel for every rgb-color (16777216 to be exact); not one color missing, and not one color twice.
What a cool project! As regular readers will know, I love messing about with image manipulation in PHP, so when I heard about the allRGB project I knew I had to make an entry for it. A few false starts and about half an hour later, I proudly submitted my first entry, a 4096×4096 PNG image containing every single possible RGB colour. As one redditor put it, “It’s like poetry, just without words.”
Click for the high resolution (only 173Kb)
And now on to the code:
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PHP ImageStringRight / Center / Italic
Posted by Howard Yeend in PHP on April 24, 2009
PHP’s built-in ImageString function is OK, but I often find it lacking some of the basic features you’d expect. So I’ve created ImageStringRight, ImageStringCenter, ImageStringItalic, and a few other goodies for writing text to images in PHP.
Image String Enhanced!
Demo and source code after the break!
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PHP 4/5 Image Blur
Posted by Howard Yeend in PHP on April 21, 2009
It’s not something that people require very often, but occasionally the need does arise and you have to ask: how do I blur an image in PHP? Here is some PHP ImageBlur code that works on PHP4 and 5.
What we end up with is a small fast function that can take a source image and create something like the following:
 No Blur |
 PHP5 ImageConvolution |
No Blur |
 PHP4 myImageBlur |
In PHP 5 you can just use ImageConvolution and the code example right out of the manual:
$gaussian = array(array(1.0, 2.0, 1.0), array(2.0, 4.0, 2.0), array(1.0, 2.0, 1.0)); ImageConvolution($image, $gaussian, 16, 0);
That’s a nice Gaussian blur in PHP5 for you. But what about your nasty old PHP4 servers? I have the answer. Actually the answer is probably “use ImageMagick and a system call”, but if you want a pure PHP/GD solution, read on.
Using a crafty mix of voodoo and ImageCopyMerge, you can create a PHP 4 blur effect that is virtually identical to the PHP5 method, as you can see by comparing the results of myImageBlur with ImageConvolution above. In tests on my local server, my method takes on average 0.43 seconds to blur a 1024*768 image, while ImageConvolution takes 0.40 – so it’s basically the same, and half a second to blur a desktop sized image is pretty decent – on a live server it’ll be even faster!
There’s some more comparisons and the source code after the break:
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PHP Digital Camouflage
Posted by Howard Yeend in PHP on April 20, 2009
The other day I was looking at demoscene videos on youtube (do yourself a favour and watch it!) and it made me think back to my PHP image hacking days. One thing led to another and I ended up saying to my partner Linds that I’d write her a little PHP demo. 3 hours later, I had digital camo in PHP (click the images for an online demo; refresh to cycle through the different types):
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The Online Demo generates larger camo patterns and has a few other camo types; refresh it to cycle through them.
Let me know if you find a use for this code :)
After the break, I go into the detail of how the code is constructed, and you get a funky debug image too!
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3D PHP – playing with ImageCreate
Posted by Howard Yeend in PHP on March 19, 2009
A PHP city (it gets better after the break):
Basically I was bored one day and decided to play around with ImageCreate and ended up making this “crate” demo (click the image for some other experiments).
And then everything got a bit silly and I made this:
Save & Follow
