To get the best image quality from a digital camera, you need to shoot in camera raw (.dng). Raw files contain more detail compared to a jpg file. I'd shown before and after images to my Photoshop class, and demonstrated how to use Camera Raw but students tended to accept the image basically as it stood.
The goals of this assessment were to use the SAAC scientific method and integrate scaffolding into the process to generate an atmosphere of analysis, experimentation, and data recording by which students would improve image quality. When the module was first offered, the results were weak. Students couldn't explain why they had made certain changes and their end products lacked the desired quality. After reassessing my requirements, I realized that there was a lack of scaffolding in the Worksheet. This was redesigned with quite specific subheadings which guided the students through the process. This module was offered a semester later with much improved results - see the attached description of the process for details.