Imaging API getPixels, alpha data with grayscale images?

Photoshop
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Has anybody been able to get alpha data for a grayscale image? hasAlpha is always false and there is only one component. With RGB, if there is alpha I get 4 components and hasAlpha is true. PhotoshopImageData says it supports “GrayscaleAlpha” but maybe it is just not implemented?

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Maybe @jsbache could know if/how grayscale with alpha is supported?

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