Different output - Acrobat vs Web Preview

[default5rs9k1a5q1qz]

Hi Guys, I'm exporting a huge PDF and I noticed that the output is different when viewed on Adobe Acrobat vs Web Preview. Can you guys help? See below photos for reference.

Adobe Acrobat (1st photo - intended output) - Facing Pages, black and white photo or no overprint

Web Preview (2nnd photo) - Single Pages, colored photo or overprint preview

Thank you so much!

[Robert at ID-Tasker]

What do you mean by "Web preview"? Browser?

[Dave Creamer of IDEAS]

I'm confused--are both photos supposed to be in color or both in B&W? 

[default5rs9k1a5q1qz]

Supposed to be in B&W

[Willi Adelberger]

Are you aware, that only Adobe Acrobat is the only valid PDF viewer. All others do not support the full range of PDFs flairs. Specially if transparency or spot colors are part of the PDF. You cannot expect to get the correct result in a PDF web browser.

[Dave Creamer of IDEAS]

I know Chrome can use the Acrobat extension, but I've never really looked at print-oriented PDFs with it. I always download and open directly in Acrobat Pro. 

[default5rs9k1a5q1qz]

Thank you so much. I was just considering the people that might use a browser to view the design instead of Adobe Acrobat and will see the colored version instead of the intended black and white version.

[Robert at ID-Tasker]

Thank you so much. I was just considering the people that might use a browser to view the design instead of Adobe Acrobat and will see the colored version instead of the intended black and white version.

By @default5rs9k1a5q1qz

If you've no control over the viewing application - you should prepare "flattened" version - make your image(s) B/W in Photoshop, etc. 

[leo.r]

Adobe Acrobat (1st photo - intended output) - Facing Pages, black and white photo or no overprint

Web Preview (2nnd photo) - Single Pages, colored photo or overprint preview

By @default5rs9k1a5q1qz

In addition to other questions:

Do you imply that when you enable overprint preview in Acrobat, your photo turns into the color photo as seen in "Web Preview"?

[Willi Adelberger]

Another problem is, that web browser show RGB screen documetnts. Print documents with CMYK output can only be shown with shifted colors.