Is there a way to prevent Acrobat from detecting a scanned books' white page background as an image?

[siegmund5EAD]

I'm talking about books that are just plain black on white text (eg this one) but Adobe Acrobat Pro DC 2020 thinks that the white background is an image. Thus, Acrobats' Dark Mode feature doesn't apply on the page background.

Any idea on how to fix this or do you know alternatives?

Btw, I also tried using the Dark Reader Chrome Extension (with all possible settings) to open PDF files in my browser and look at them using dark mode there but the result looked quite bad, unlike on most other websites.

[AkanchhaS]

Hi,

Thanks for sharing the document.

To understand your concern, we need a little bit more clarity on what and how exactly you are trying to achieve.

1- Are you referring to the dark mode theme on desktop application or Mobile app Adobe Acrobat Reader.

2- When changing the display theme to Dark, were you expecting the page background to be changed or turned to darker?

3- How did you create this file? Was it scanned and then converted to a .pdf?

Based on the assumption, we'll try to answer your question as accurate as possible:

1- On desktop application you can change the application's Display theme only. For e.g Acrobat>View>Display Theme>Dark Grey/Light Grey. This is not going to change the page background. Be it a scanned document or the one with real text. [To double check, open any other file with real text and try the same.]

2- To change the page background, Open document>Edit>Preferences (Ctrl+k)>Accessibility> Document options>replace Document Colour.

Thanks,

Akanchha

[siegmund5EAD]

@AkanchhaS @JR Boulay @Test Screen Name 

1 I'm using Windows 10 Pro 64 bit with the Desktop version.

2 I am using the applications' Display Theme->Dark Grey in conjunction with the "Replace Document Color"-settings so I was expecting the latter to be changed too, which does happen on a document I created in Adobe but doesn't for this external document.

3 Looks like a scanned document to me. Acrobat does however detect its' text accurately so I hoped that it was able to recognize it as a document and not an image or that there was some way to make it do so.

[siegmund5EAD]

so I hoped that it was able to recognize it as a document and not an image or that there was some way to make it do so.

By @siegmund5EAD

no suggestions?

One workaround I discovered was that a commercial version I bought of that book (and was luckily able to refund to get my 150€ back) was recognized by Acrobat as a text-with-background document instead of an image document. So I was able to apply Document Color settings there. But this option may not be around for each document, so I was hoping for a way to change the document itself to have Document Color settings take effect.

[JR Boulay]

I'm talking about books that are just plain black on white text (eg this one)

This book is plain white with black text!!!

[Test Screen Name]

Doesn't seem to me that dark mode should change the designed or actual colour of a page. But it can be done. Look at the Accessibility Preferences. 

[Karl22805108wg66]

I asked this question, more extensively, here.