Teldurn wrote:The best I've been able to get is convert the image to greyscale, then adjust the brightness/contrast to get better black/white areas, and finally hit it with a pencil sketch filter. It doesn't look quite the same, so if anyone else has a better strategy, I'd love to hear it.
If your starting image is a colour image use a Brightness/saturation adjustment layer to remove the colour.
Next apply a levels adjustment layer and try playing around with the settings.
Don't convert the image to greyscale as you won't then be able to tint the image to match the HQ card images.
As drathe has already said, the result is not exactly as the image types are different.
To compare photoshop (left) with inkscape (right)