convert PDFs to "night mode" by inverting colors?

soondai · 01-26-2011, 04:03 AM

I love my PDN for reading PDFs. The only thing that keeps it from being perfect is the bright glare of the white page. AdobeX on Android does not let you invert the colors as you read like Adobe Reader does on the PC.

Is there any method or program that will let you flip the colors on a PDF and save it--- so that you get white text on a black page?

The only method I could find online involved turning the PDF into an image, which would almost certainly make the file too big to work very well.

Anyone know of an easier method?

meem · 04-01-2011, 07:22 PM

Here is the method:

1- Extract PDF file into images.
2- Use patch conversion tool to invert the colors.
3- Convert images files to PDF again.

I hope a special tool will be developed to do this function easily.

DSpider · 04-08-2011, 04:47 AM

There was no reason to even attempt this. Most readers do it on-the-fly. Heck, even older Bookr versions from 2007 (Bookr being a homebrew PlayStation Portable reader) can do it. And not just text, images and objects too.

I'd lol at your 2009 reader for not being able to do this.

There has to be an option, firmware update, or even if there isn't, maybe there's a custom firmware that allows this.

Also, I think e-Ink text is better black on white. In theory, the more e-Ink molecules are activated the more the battery drains.

meem · 04-17-2011, 03:07 AM

Yes, but the question about "E-Reader devices" not "Tablet Computers" or multimedia devices like iPod Touch.
There none can do it til now (according to my knowledge).

DaleDe · 04-17-2011, 11:38 AM

Quote:

Originally Posted by meem

Yes, but the question about "E-Reader devices" not "Tablet Computers" or multimedia devices like iPod Touch.
There none can do it til now (according to my knowledge).

eBook reading devices do not modify the files they read. They often do, however, support a night reading mode where they invert the colors of the data to the screen. My literati has this feature.

Dale

frabjous · 04-19-2011, 02:27 PM

I wrote some instructions on how to do this using ImageMagick in this old thread.

anarkhos · 08-06-2011, 11:47 PM

@DaleDe
Your literati can invert colors at will? Is it an e-ink reader, or LCD?

DaleDe · 08-06-2011, 11:55 PM

Quote:

Originally Posted by anarkhos

@DaleDe
Your literati can invert colors at will? Is it an e-ink reader, or LCD?

Literati is an LCD screen.

Dale

01-26-2011, 04:03 AM	#1
soondai Fanatic Posts: 556 Karma: 1028940 Join Date: Aug 2010 Device: a few	convert PDFs to "night mode" by inverting colors? I love my PDN for reading PDFs. The only thing that keeps it from being perfect is the bright glare of the white page. AdobeX on Android does not let you invert the colors as you read like Adobe Reader does on the PC. Is there any method or program that will let you flip the colors on a PDF and save it--- so that you get white text on a black page? The only method I could find online involved turning the PDF into an image, which would almost certainly make the file too big to work very well. Anyone know of an easier method?

04-08-2011, 04:47 AM	#3
DSpider Addict Posts: 368 Karma: 298951 Join Date: Nov 2009 Location: Romania Device: iPod touch 2G (16 GB)	There was no reason to even attempt this. Most readers do it on-the-fly. Heck, even older Bookr versions from 2007 (Bookr being a homebrew PlayStation Portable reader) can do it. And not just text, images and objects too. I'd lol at your 2009 reader for not being able to do this. There has to be an option, firmware update, or even if there isn't, maybe there's a custom firmware that allows this. Also, I think e-Ink text is better black on white. In theory, the more e-Ink molecules are activated the more the battery drains. __________________ The The Impotence of Proofreading LayoutPrep – a custom Word macro that preps your OCR content for styles Resources for identifying fonts Last edited by DSpider; 04-08-2011 at 04:53 AM.

04-19-2011, 02:27 PM	#6
frabjous Wizard Posts: 1,213 Karma: 12890 Join Date: Feb 2009 Location: Amherst, Massachusetts, USA Device: Sony PRS-505	I wrote some instructions on how to do this using ImageMagick in this old thread. __________________ DRM = ☹

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Changing colors of "hover over" balloons	mark121	Calibre	2	11-23-2010 04:34 PM
Free Audiobook from Audible: "In the Forests of the Night"	RockdaMan	Deals, Freebies, and Resources (No Self-Promotion)	2	11-22-2010 06:26 PM
"Night Vision" (Jake Lassiter Series) Now $2.99	Paul Levine	Author Self-Promotions	0	08-14-2010 09:52 PM
Suggested enhancement: opt. easy-to-read colors for "View"	jj2me	Calibre	2	01-04-2010 01:23 PM
Nemoptic worked in "stealth mode" on e-paper / initially no e-books	Alexander Turcic	News	3	04-20-2007 11:23 AM

04-01-2011, 07:22 PM	#2
meem A Reader who can think..! Posts: 254 Karma: 65662 Join Date: Jul 2010 Location: Earth Planet Device: Kindle 3 WiFi - Kindle DX (B004)	Here is the method: 1- Extract PDF file into images. 2- Use patch conversion tool to invert the colors. 3- Convert images files to PDF again. I hope a special tool will be developed to do this function easily.

04-17-2011, 03:07 AM	#4
meem A Reader who can think..! Posts: 254 Karma: 65662 Join Date: Jul 2010 Location: Earth Planet Device: Kindle 3 WiFi - Kindle DX (B004)	Yes, but the question about "E-Reader devices" not "Tablet Computers" or multimedia devices like iPod Touch. There none can do it til now (according to my knowledge).

08-06-2011, 11:47 PM	#7
anarkhos Junior Member Posts: 1 Karma: 10 Join Date: Aug 2011 Device: Nook E-Ink	@DaleDe Your literati can invert colors at will? Is it an e-ink reader, or LCD?


Advertisement Enthusiast