std.algorithm for images

[bearophile]

Adam D. Ruppe:

> I'm pretty happy with how simpledisplay.d is turning out,

I have tried the fractal tree program, the window doesn't close if you click on the button on the top right.


> http://arsdnet.net/dcode/imagedraft.d

I suggest you to always compile your D code with -w, in imagedraft.d there is a switch (line 328) without default.


foreach(line; filter!"a.pixels[0].r > 200"(png.byRgbaScanline)) {
I suggest ==>
foreach(line; filter!"a.pixels[0].r > 200"(png.byRGBAline())) {
Or even:
foreach(line; filter!"a.pixels[0].r > 200"(png.byRGBAScanline())) {


> What kind of ranges would be useful?

Several basic image processing algorithms use a 3x3 (or bigger) neighbourhood to process images.


> A byPixel perhaps?

Of course :-)
For few ideas look at Python PIL docs:
http://www.pythonware.com/library/pil/handbook/index.htm
http://www.pythonware.com/library/pil/handbook/image.htm


> Thanks for all the feedback this weekend, everyone!

You are welcome :-)

Bye,
bearophile