Premium version only
For example, when enabled and
src="sampletext-1024x504.png" the file sampletext.png will be used (if no load error) as the drawing source for the lens.
Circle – no true source lens
This first image’s lens has the ‘Use true source’ option disabled. Whatever the level of magnification the last couple of lines of text remain blurred and illegible.
This second image’s lens has the ‘Use true source’ option enabled. It uses the true uploaded image ( which is 2000 x 998) for its drawing source. As such, at 4.30+ magnification, it is possible to read the very last line.