by eValid » Mon Mar 04, 2013 8:18 am
Sorry, this one's "outside the scope" of what eValid can do.
And, sorry to point this out, the general question of reading text that has been rendered into an image is quite a difficult one. For this you need "optical character recognition (OCR)" applications that scan the pixels and search for edges (differences in color/intensity) in the image, and decode the pattern of detected edges into letters and numbers.
That's a whole different technology that what eValid is all about.
However, eValid can compare two images and tell you if they are identical or not. And it can do this with masks on the images so that you focus on the correct area in the image. That is done with the "image difference" utilities that are packaged with eValid; they work on pixel-by-pixel comparisons and are very reliable (and very sensitive).
As a general note, in most cases when HTML is rendered into a screen image -- such as the image you are reading at this moment when you read this posting -- the information about the original character strings is lost in the conversion and is very difficult to recover. eValid can process text on the screen using the DOM version of the text that was used to generate what you seen on the screen. That's VASTLY different from extracting text from images.
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