Posts Tagged: image manipulation

A Script A Day – Corner Cut – Day 05/05

I decided to do something with ImageMagick for my 5th day’s script. My original idea for day 5 proved to be too much for one night. A script to cut triangular corners into images. Pretty simple, but this may come in handy one day while designing something.

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Image Color Dominator

Most anyone who’s used iTunes’ album view will know about their color picking mechanism.  I was curious about how this might be done and found this question on Stack Overflow: How does the algorithm to color the song list in iTunes 11 work?

So I set about creating an equivalent in PHP.  I settled on using the IMagick PHP extension for grabbing pixel data and doing blurs.

The Results

mizu Mizu (Water)

moon Tsuki (Moon)

fall Aki (Fall)

Chibi Chibi ^_^

The How

It’s largely based on the accepted answer given on the Stack Overflow question mentioned earlier. Except I separate potential highlights from the selected background based on a luminance ratio which produces more readable text, and there’s some additional logic for trying to pick contrasting highlight colors.

The Source

Source is available on BitBucket: Not much in the way of documentation, so hopefully the comments on the class aren’t horrifically confusing. I’ll re-read them later and maybe make changes.

ImageMagick: Rounded-corner PHP function

I’ve converted my rounded-corner bash script into a PHP function that’ll use the Image Magick command line tools to do the same. With some added functionality to handle automatically creating thumbnails and applying a background color to the source image itself. This also allows for the insertion of basic pre-processing and post-processing arguments to IM.

For more information and output examples see. the bash version.

To see an example of thumbnails generated with some pre-processing done:

First Preprocessor Test

This is a sample done with thumbnail pre-processing. That is processing done before the rounded corners are made.

With this sample, I switched colorspace to HSL and then set the hue and saturation to a constant before applying the glass-bubble rounded corners.

Known bug: sometimes the glass-bubble method will add a single pixel to the width, which is transparent. I believe passing -trim in the postprocessing option may trim that off for you, though I have not thoroughly tested it.

Also: I have no idea if this will work on a Windows server.

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Rounded Corner Script

Script Download: (v2)

Ever wanted a script that would round the corners of images for you?  Well, if you said yes, I wrote myself a bash script to do just that.  As of this post it can do the following: round of corners of images and it can also add a glass-bubble effect as described in the ImageMagick tutorials.  You can specify the border radius and a background color, which is handy if you are making JPEGs.  The script’s help screen is shown below, as well as a couple of samples.  Radius sizes are in pixels.

./ <inputfile> <outputfile> [options]
  -m   Method [plain or glass-bubble]
  -r   Corner Radius
  -b   Background Color
Method can be plain or glass-bubble at the moment. (default: plain)
Radius specifies the radius of the rounded corners. (default: 15)

Note: This should be able to function as filter command, so if you wanted
rounded thumbnails of a particular size you can:
convert <bigfile> -resize 200x200 png:- | ./ png:- smallrounded.png" 1>&2