Question about PixelDensity

thanks for this library, its cool.

I ran into something - if I set pixelDensity(displayDensity()); in my sketch to work in HiDPI , seems that the imageprocessing library might not be compatible, it throws a lot of exceptions with TiltShift , Threshold, etc.

Do I need to set something in the constructor?

[Milchreis]

Thank you for your reply.

I took over the MacBook of my lovly wife ❤️ and do some tests. The main problem is, that createGraphics sets the pixelWidth and pixelHeight values for PGraphics depending on the pixelDensity-value. Instead PImage has pixelWidth and pixelHeight regular.

In the end the line sharp.mask() fails, because the two images have different dimensions.

With f2f1a4dfc670b5f7315fdd7891de2765f9ca932b I commited a workarround to avoid that error. Instead of image.copy() I wrote a method to copy an image by redrawing it on PGraphics. In that way the result has the same width and height attributes.

For Classes that using PGraphics I could not reproduce this error.

[cristianvogel]

delving deeper into some debugging… this issue affects TiltShift ( this one I use its very cool ) and Blend and the others that create off screen PGraphics

public class TiltShift {

	public static PImage createMask(PImage image, int blurIntensity, boolean horizontal, int position, int width) {
		
		PGraphics mask = image.parent.createGraphics(image.width, image.height);
		PApplet main = image.parent;
		
		int c1 = 255;
		int c2 = 0;
		
		mask.beginDraw();
		mask.background(0);
		
		for (int i = 0; i <= width; i++) {
			float inter = PApplet.map(i, 0, width, 0, 1);
			int c = main.lerpColor(c1, c2, inter);
			mask.stroke(c);

			if (horizontal) { 
				// Top to bottom gradient
				mask.line(0, position + i, image.width, position + i);
				mask.line(0, position - i, image.width, position - i);
				
			} else { 
				// Left to right gradient
				mask.line(position + i, 0, position + i, image.height);
				mask.line(position - i, 0, position - i, image.height);
			}
		}
		
		mask.endDraw();
		
		return mask.get();

when TiltShift is applied and PixelDensity is 2, then that PGraphics mask = image.parent.createGraphics(image.width, image.height); seems to fail…