Commits on Aug 1, 2018

1. Add more validation of the /Filter entry, in image dictionaries, to t… …

   …he `PDFImage` constructor
   
   Given that the code is currently assuming that the /Filter entry is a `Name`, it cannot hurt to actually ensure that's the case.
   
   Also fixes an error message, for JPEG 2000 images with unsupported ColorSpaces, since `this.numComps` hasn't been initialized when it's accessed during the `throw new Error()` invocation.

   

   Snuffleupagus committed Aug 1, 2018
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2. Prefer the Width/Height of the image data, rather than the image dict… …

   …ionary, for JPEG 2000 images (issue 9650)
   
   According to the PDF specification, see https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#page=45
   > When using the JPXDecode filter with image XObjects, the following changes to and constraints on some entries in the image dictionary shall apply (see 8.9.5, "Image Dictionaries" for details on these entries):
   >
   >  - Width and Height shall match the corresponding width and height values in the JPEG2000 data.
   >
   >  - . . .
   
   Hence it seems reasonable to use the Width/Height of the image data *itself*, rather than the image dictionary when there's a mismatch. Given that JPEG 2000 images are already being parsed, in order to obtain basic parameters, the actual Width/Height is readily available in the `PDFImage` constructor.

   

   Snuffleupagus committed Aug 1, 2018
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