{"id":885,"date":"2017-07-04T14:21:38","date_gmt":"2017-07-04T18:21:38","guid":{"rendered":"https:\/\/carleton.ca\/rangifercentral\/?page_id=885"},"modified":"2017-07-04T14:39:22","modified_gmt":"2017-07-04T18:39:22","slug":"colour-pixel-plotter-case-study-1-a-quick-look-at-monck-park-rock","status":"publish","type":"page","link":"https:\/\/carleton.ca\/rangifercentral\/rock-art-visual-analysis\/case-studies\/colour-pixel-plotter-case-study-1-a-quick-look-at-monck-park-rock\/","title":{"rendered":"Colour Pixel Plotter – Case Study #1: A quick look at Monck Park Rock"},"content":{"rendered":"

Subject:<\/strong> Digital photo of ‘Monck Provincial Park Rock’ on Rockwall.
\nTool Used:<\/strong> Colour Pixel Plotter (CPP) and Photo Viewer\/editors.
\nMethod:<\/strong> Using Colour Pixel Plotter to ‘construct’ the pictograph image by selective colours<\/p>\n

For this pictograph study, our goal is to dissect the entire object to its individual colour components. Where colour is faded, deteriorated, peeled-off or missing, there should be some means of ‘reconstructing’ these affected areas. To this end, CPP will load each pixel’s RGB value into a table with its x\/y coordinates; and will plot only the ‘selected’ ones on a uniform background (default is white) at its original x\/y position. The pixel ‘selection’ is defined by the user in terms of RGB triplets in a formula-like format. Depending on the actual needs and on individual photo bases, the user can construct a ‘photo’ with one or many formulae as well as which part of the photo to be plotted.<\/p>\n

The separation of colours and plotting them either individually or in combinations should allow the scientist to study the following :<\/p>\n

    \n
  1. the sequence of colour applied – such as background colour, or over-painting<\/li>\n
  2. whether or not the colour pigment is layered (with some binding agent) or chalk-like<\/li>\n
  3. the surface(rock) colours and texture – given sufficient details<\/li>\n
  4. the component objects may show different colour brightness – may be by different time\/creator<\/li>\n
  5. the possibility of part of rock or patch of ‘paint’ (with colours) peeled-off to aid peel search<\/li>\n
  6. the entire pictograph may be a 3-dimensional object and should be studied in sections<\/li>\n
  7. the colours and potential fragments (both paint and rock) that may be found when evacuating soil below<\/li>\n<\/ol>\n

    Our Study Plan:<\/strong><\/p>\n

      \n
    1. Study the photo image using a photo viewer\/editor (Paint.net and Gimp in this case)<\/li>\n
    2. Load the photo into CPP system<\/li>\n
    3. Define Colour formula for the photo<\/li>\n
    4. Plot by colours to seek outlines of objects – and sequences of colours applied (if any)<\/li>\n
    5. Refine colour formula for better or more detailed coverage<\/li>\n
    6. Observe and analyse differences between objects for component colours and textures<\/li>\n
    7. Summarize findings and define future study plan<\/li>\n<\/ol>\n

      Journal of plots from the study<\/h2>\n

      1. Original Photo<\/h3>\n

      The original photo from Monck Park rock, observed using 100% zoom :\u00a0\"\"<\/p>\n