Re: inputScale limitation in CIPixellate

I'm using the CIPixellate filter to simulate machine vision through differing sensor array grids. This means I need to be able to convert an input image to 1x1, 2x2, 4x4, 8x8, 16x16, etc., up to full resolution.

Instead of providing some sort of "resultBlocks" argument, the CIPixellate filter uses an "inputScale" argument, which goes from 1 to 100. So, starting with an input image of 800x800, the lowest pixellation value I can achieve is 8x8.

How can I achieve 1x1, 2x2, and 4x4 pixellations? I also have cases that use larger images. Is it possible to go beyond the 100 maximum for inputScale?

Yes you can. The relevant attributes for the scale parameter in CIPixellate are:

        CIAttributeMin = 1;

        CIAttributeSliderMax = 100;

        CIAttributeSliderMin = 1;

so the 1-100 range is only the recommended slider range if an application wants to create UI ... the parameter does not have an upper limit (CIAttributeMax key is not present), so you can set it to the image width to get 1x1 pixellations.

hope this helps,

- Ralph