How to convert selected pages to black and white in one shot?

Question

Hi,

I have a pdf document with 1000 pages.

800 pages is in colour, 200 black and white and I wish to reduce colour pages to 500 pages.

I have a list of selected pages that need to be in colour and I also have a list of pages that should be black.

There is an option to convert colours in Adobe but there is no way to paste a list of pages and you can not select thumbnails neither and then convert.

You can only give a range page 1-1000 for example or give a single page number but you can not ask for conversion of pages for example: 3,5,7, 25, 80, 500 and convert them all in one go.

I heard that Java could handle such a task but unfortunately I can not find good example.

If there would be some plugin being able to perform such task that would be great!

Thank you for your answers.

Abambo · Answer

There may be a solution using scripting. You should ask this question in the scripting forum. Or I can move this thread there.

A preflight action exists, but I think that one works also on the whole pages.

A possibility would be to convert the whole file and exchange the pages. This works fine if you have only one document. If you need something for a recurring job, exchanging pages could only be a workaround until a better solution has been found.

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