ios - How To implement double exposure for picking images? -

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in app i'm having 2 imageviews, first imageview constant , second imageview ,after picking image zoom , can place in view , second image merged first image , after merging second imageview nil , first imageview having 2 images , can pic many images in second imageview , can move anywhere need pic single image @ single time.how implement this.?.thanks in advance.

a simple image has 32bit of color information per pixel (rgb: ff ff ff), grayscale image has 8bit. should obvious conversion 32bit 8bit not reversible.


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