Allocating ofImage with GL_RGB doesn't give any warnings

@hamoid wrote:

Hi,

By accident I used GL_RGB to allocate an ofPixels and then spent a long time debugging why the width was 0 (assuming it was related to vectors and std::move), until I realized I should have used OF_IMAGE_COLOR instead.

// wrong
ofPixels p;
p.allocate(w, h, GL_RGB);

Functions like ofPixelFormatFromImageType and channelsFromPixelFormat give warnings when trying to use an unrecognized image type. Couldn't this check also be done when using GL_RGB?

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