One of the issues I’m having to confront in the autohalftoning work has come up before in my image-processing programming, but I’ve always sidestepped it. When I write an image-manipulation program, I try to parameterize all of the options, rather than change the code to invoke them. It makes it a lot easier to go… [Read More]
Archives for April 2014
Adding a dc component to autohalftoning kernels
In addition to kernel size and construction, you can also get useful effects by making the kernel sum to numbers slightly larger than one. This means that the kernel is not strictly a highpass filter, but will preserve some low frequency information. You don’t want much; multiplying the center element of a fence kernel by… [Read More]
Fence kernels for autohalftoning
I didn’t have any writing to do yesterday, since the blog was given over to prewritten April Foolery, so I messed around with convolution kernels. I came up with a class that seems to give interesting effects. Kernels in this class, which I’m calling “fence” kernels, are square with odd numbers of rows and columns…. [Read More]
Irrational aspect ratios
Since the dawn of digital photography, practitioners of the art have been barred from a creative freedom enjoyed by their image-making predecessors. Oil and watercolor painters, printmakers, and, yes, chemically-based photographers could make an image any shape they wanted to. Not so in the digital world. When cropping a raster image, a digital photographer must… [Read More]