Fixes for some common PDF to PDFA conversion validation errors

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Title Fixes for some common PDF to PDFA conversion validation errors
Detailed description From PDFBox Preflight:
Syntax Error: invalid float range in Number operand

From Adobe Preflight
Syntax problem: Real value out of range (too high) (also commonly get the other extreme - too low)

Solution to this issue was to use PDFA2 as the original PDFA1b spec is unable to cope with large numbers either negative or positive. The error in this case was caused by a bezier curve with a high value.

From PDFBox Preflight:
Invalid color space...

Solution - this was fixed by the Adobe Acrobat by making the default colorspace to be sRGB

From PDFBox Preflight:
Invalid font definition

From Adobe Preflight
CIDset in subset font is incomplete
Font not embedded

Solution (perhaps) - this was 'solved' by Adobe Acrobat Preflight by turning the pages into raster images and putting the text as an invisible layer so it was still searchable. This was not an ideal solution as it lost the vector aspects of some of the illustrations (archaeological site plans). As the vector aspects of these illustrations is often seen as a significant property of the file it is not adequate solution for this use case.
Solution Champion Jo Gilham
Corresponding Issue(s) Common validation error messages from PDF to PDFA conversion
Tool/code link  
Tool Registry Link  
Evaluation Partial success
solution solution Delete
opf opf Delete
preservingpdf preservingpdf Delete
validation validation Delete
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