This folder includes data for our usability user study. 
- usability_feedback.csv: responses to the survey after experiments with our tool and a familiar software, generated by Google Forms. We referred our tool as Color Curves in the survey for simplicity. Column E to I are Likert-scale questions where 1 corresponds to Disagree and 5 corresponds to Agree. Please see the first row of the form for the prompts in the survey.

- images: each sub-folder in images include three images. The file original is the input image, cgc_edited is the output generate with our tool (Chromaticity Gradient Curves) and {photoshop|photoscape}_edited is the output from user's choice of software. 

* Note that we included one extra image for user D since they initially experimented our tool with this image, but failed to make an edit that they were satisfied with. They intended to increase the contrast between the yellow cloud and the blue sky. Admittedly, it is very hard to achieve such effect without our tool because the cloud and the sky have similar illuminance but chromaticity in opposite direction. 