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williamj58744152
williamj58744152
Participant
February 4, 2019
Answered

JPG pixel coordinates to PDF coordinates converter?

Hello,

Does anyone have a tool or know of the pixel conversions for a JPG image point to PDF document location?

Regards,

William Johnston

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Thom Parker
Thom ParkerCorrect answer
Community Expert
February 4, 2019

Images are images, regardless of the file format they are all an array of pixels. The PDF  coordinate spaces are all measured at 72points/inch.  So if you know the image location, width, and height in PDF coordinates, then it's a straight forward conversion to find the location of a pixel.

For example, to get the horizontal coordinate:

xPDF = xImageCoord + xPixel * ImageWidthPDF/ImageWidthPixels

Of course, how this is done depends on the context. What are you trying to do?

Thom Parker - Software Developer at PDFScriptingUse the Acrobat JavaScript Reference early and often
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2 replies

Thom Parker
Community Expert
Thom ParkerCommunity ExpertCorrect answer
Community Expert
February 4, 2019

Images are images, regardless of the file format they are all an array of pixels. The PDF  coordinate spaces are all measured at 72points/inch.  So if you know the image location, width, and height in PDF coordinates, then it's a straight forward conversion to find the location of a pixel.

For example, to get the horizontal coordinate:

xPDF = xImageCoord + xPixel * ImageWidthPDF/ImageWidthPixels

Of course, how this is done depends on the context. What are you trying to do?

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Thom Parker - Software Developer at PDFScriptingUse the Acrobat JavaScript Reference early and often
williamj58744152
williamj58744152Author
Participant
February 6, 2019

Hello,

I would like to insert highlighted text from JPG images from Microsoft Azure Computer Vision OCR API.

Thanks for letting me know on the dpi for PDF.

I may need to create a formula.

Thank you.

Sincerely,

William Johnston

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