I disagree with the approach of flattening, printing, or otherwise destroying information in the final-result file, because there can be a lot of learning value for the students in having the solution. The approach of manipulating the image in some way and attempting to detect that modification in the result could work, although it seems like a lot of effort.
Instead, could you require the students to submit the intermediate results as well? That way you have more evidence that the students actually performed the steps. Also, if there is any variation in the steps, it gives you more information about possible copying between students if all intermediate results are the same in addition to the final result.
I completely agree with the gripe about the lack of solid information about candidates views (other than supporting non-controversial positions). The best source that I have found for such information is Project Vote Smart http://www.vote-smart.org/ and specifically candidates responses to the National Political Awareness Test (NPAT) http://www.vote-smart.org/npat_about.php - which gathers information on the candidates' positions on political issues.
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I disagree with the approach of flattening, printing, or otherwise destroying information in the final-result file, because there can be a lot of learning value for the students in having the solution. The approach of manipulating the image in some way and attempting to detect that modification in the result could work, although it seems like a lot of effort.
Instead, could you require the students to submit the intermediate results as well? That way you have more evidence that the students actually performed the steps. Also, if there is any variation in the steps, it gives you more information about possible copying between students if all intermediate results are the same in addition to the final result.
I completely agree with the gripe about the lack of solid information about candidates views (other than supporting non-controversial positions). The best source that I have found for such information is Project Vote Smart http://www.vote-smart.org/ and specifically candidates responses to the National Political Awareness Test (NPAT) http://www.vote-smart.org/npat_about.php - which gathers information on the candidates' positions on political issues.