In this blog we are going to write an example on how to extend the SEO Toolkit functionality, so for that we are going to pretend our company has a large Web site that includes several images, and now we are interested in making sure all of them comply to a certain standard, lets say all of them should be smaller than 1024x768 pixels and that the quality of the images is no less than 16 bits per pixel. Additionally we would also like to be able to make custom queries that can later allow us to further analyze the contents of the images and filter based on directories and more.
For this we will extend the SEO Toolkit crawling process to perform the additional processing for images, we will be adding the following new capabilities:
Capture additional information from the Content. In this case we will capture information about the image, in particular we will extend the report to add a "Image Width", "Image Height" and a "Image Pixel Format".
Flag additional violations. In this example we will flag three new violations:
Image is too large. This violation will be flagged any time the content length of the image is larger than the "Maximum Download Size per URL" configured at the start of the analysis. It will also flag this violation if the resolution is larger than 1024x768.
Image pixel format is too small. This violation will be flagged if the image is 8 or 4 bits per pixel.
Image has a small resolution. This will be flagged if the image resolution per inch is less than 72dpi.
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