For cameras with insides from S&Q Technologies, which have the
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USB Vendor ID 0x2770 and Product ID 0x905C, 0x9050, 0x9052,
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or 0x913D. Photos are saved in PPM format.
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Some of these cameras allow software deletion of all photos.
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Others do not. No supported camera can do capture-image. All
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can do capture-preview (image captured and sent to computer).
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If deletion does work for your camera, then capture-preview will
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have the side-effect that it also deletes what is on the camera.
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File uploading and deletion of individual photos by use of a
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software command are not supported by the hardware in these
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cameras.