KPV: a PDF reader for Kindle, based on muPDF, GPLv3

[geekmaster]

Originally Posted by eLiNK

actually, it is alt + shift + G.
But what if the program is started without the native framework (to free more memory)?

Thanks for the correction. I was in a hurry so I prefixed that with "I think" rather than testing it, hoping it would point you in the right direction (apparently it did).

Extremely busy these days (hence the "geekmaster vacation" post)...

[thomass]

a request: How about adding highlights to Myclippings.txt ? Or at least to another document but with the same format.

[dracodoc]

In fit page mode, if the page width is less than screen, there will be a gray margin on side. I think it will be lest intrusive to just display that margin in white, like how the original software does.

Besides, maybe somebody already said this:
I'd like to have the option to define some margin even in fit page mode, that means not using up all screen pixels, because it will look better with some margin in edge. Right now it is too close to edge.

[dracodoc]

About fitting options:
1. As mentioned in previous post, I wish the gray border in fit page view can be changed to small cross marks in four corner. I felt the gray border rather bothersome, and small cross marks can provide the border information and less intrusive.

2. In fit page width view, there is no indication that if there is remaining area in same page, if user press page down, it will jump to next page directly, instead of display the rest of page.

Of course the best solution for this is the continuous reading mode. But there should be some indications too. I suggest 2 small downward arrows at the two sides of the bottom if there is content left below, and upward arrows on sides of top if there is content left above.

[NuPogodi]

My unofficial patch to kindlepdfviewer-bb5c54d (April, v2). Successfully tested on K3, may not work on DX (because of the function to read the current battery level or of any other reason).

Changes are mostly made for file management:
+ primitive support for list of recent documents ('L' in filemanager)
+ brief information about the selected document ('I' or 'joypad right')
+ more shortcuts (to make screenshots 'Shift-P' & to delete documents 'Del')
+ filechooser, filehistory, filesearher, fileinfo, usw. -> redesigned to have similar face
+ helppage with a list of active hotkeys ('H') now works nearly everywhere (except filechooser itself - to do)
+ free DroidSansBold.ttf
+ some icons for various types of files
+ default cr3.css with proper style for those files that have no own css.
+ some more supported types (pdb, azw, prc, tcr); @devs: extentions are now enumerated in a single file 'extentions.lua' -> you no longer need to add them in three places.
= a bit modified epub.css (I just fixed the font = DroidSans, just for the case when default kpdf-font has no proper glyph)

Just unzip the files to the folder with kindlepdfviewer (be sure, that you still have original files). Any feedback would be acknowledged...

[eLiNK]

Originally Posted by NuPogodi

My unofficial patch to kindlepdfviewer-bb5c54d (April, v2). Successfully tested on K3, may not work on DX (because of the function to read the current battery level or of any other reason).

Changes are mostly made for file management:
+ primitive support for list of recent documents ('L' in filemanager)
+ brief information about the selected document ('I' or 'joypad right')
+ more shortcuts (to make screenshots 'Shift-P' & to delete documents 'Del')
+ filechooser, filehistory, filesearher, fileinfo, usw. -> redesigned to have similar face
+ helppage with a list of active hotkeys ('H') now works nearly everywhere (except filechooser itself - to do)
+ free DroidSansBold.ttf
+ some icons for various types of files
+ default cr3.css with proper style for those files that have no own css.
+ some more supported types (pdb, azw, prc, tcr); @devs: extentions are now enumerated in a single file 'extentions.lua' -> you no longer need to add them in three places.
= a bit modified epub.css (I just fixed the font = DroidSans, just for the case when default kpdf-font has no proper glyph)

Just unzip the files to the folder with kindlepdfviewer (be sure, that you still have original files). Any feedback would be acknowledged...

looks really nice, the battery indicator, the digital clock and all ...
Thanks.

I hope as soon as the vocation period is over, the changes will be promptly added to the main branch

Actually, a number of them have already been considered and implemented.

[aliabbasjp]

What is the maximum gamma value for the best possible contrast, should we use following settings in unireader.lua?

there are many gamma variables, which to modify and how much?

-- gamma setting:
globalgamma = 1.0, -- GAMMA_NO_GAMMA

[knc1]

Originally Posted by aliabbasjp

What is the maximum gamma value for the best possible contrast, should we use following settings in unireader.lua?

there are many gamma variables, which to modify and how much?

-- gamma setting:
globalgamma = 1.0, -- GAMMA_NO_GAMMA

Kindles use a reflective display, so a gamma (light emission level vs signal level) value for a "linear" response (gamma=1) should be correct.
I.E: Since the display is "true grayscale" the hardware should be producing a linear response.

Edit:
If you want to check up on the hardware designers, try this web-site with test graphics (*.gif): http://www.photoscientia.co.uk/Gamma.htm

[aliabbasjp]

Thanks,

i wanted to increase the default gamma level since the pdf pages appear very light, each time i need to "+" to increase the gamma.I want the gamma to be at max as default

[geekmaster]

Originally Posted by aliabbasjp

Thanks,

i wanted to increase the default gamma level since the pdf pages appear very light, each time i need to "+" to increase the gamma.I want the gamma to be at max as default

Increasing gamma lightens dark areas of the image. To darken it you need gamma values less than one. You can also darken light areas (an "S-curve" hack) by gamma adjusting a NEGATIVE of an image, then convert the adjusted negative to a positive, when "photoshopping" an image.

Some content (especially from video cameras) has the gamma pre-adjusted to 0.45 gamma, to compensate for the 2.2 gamma of television CRT phosphors. That would make it look much too bright on a kindle reflective display, and may need to be linearized to darken it, using a gamma of 0.45. However, some adjustment may already have been done when it was digitized, so you really need to use whatever gamma adjustments bring out the most detail in the dark areas without washing out the bright areas, when viewed on your intended target display device.

When doing gamma adjustments on a CRT, it is critical to calibrate the gamma on your CRT. On an LCD, it is hopeless, because LCD gamma cannot be made linear, and varies greatly with brightness settings (but they are getting better).

EDIT: It is possible for software to be misconfigured to make an image darker with a gamma "+" button, but that would be a software bug or a design flaw.

[aliabbasjp]

i just wanted to darken the text to maximum level as default without pressing "+" each time ??????

[geekmaster]

Originally Posted by aliabbasjp

i just wanted to darken the text to maximum level as default without pressing "+" each time ??????

If the software is configured to DARKEN the text with the "+" button, then it is configured "backwards" (if the "+" and "-" buttons are gamma adjustments).

So, what you are asking is how to save the DEFAULT gamma setting for text. Is that in a config file that you can edit?

DEVS: (I realize I *could* just read the code) -- is the gamma adjustment being done to the NEGATIVE image (0=white) stored in the framebuffer? If so, it would darken the light areas instead of lightening the dark areas, which is probably not a desired effect in this case.

[aliabbasjp]

Please try first before speculating !

[geekmaster]

Originally Posted by aliabbasjp

Please try first before speculating !

You said that you were pressing '+' to darken your text, and this is the opposite direction from how NORMAL gamma correction works.

ALSO, the K3 has an inverted framebuffer (unless you override that), so any gamma correction should be done after inverting the image so it is no longer a negative.

Those are facts, and not speculation. Either you have it wrong about the "+" button to darken the text, or the software has it defined backwards, or the software is incorrectly adjusting the negative (inverted) image instead of a positive image.

No speculation -- just stating facts. And while your reply appears to be a useless implied "RTFM" rejection, showing that you do not intend to see if any of my suggestions are valid and can enhance the software, your reply also DID NOT answer any of my questions, making your reply less than worthless.

@aliabbasjp: YOU are the one asking how to save the default gamma setting. If you are going to give "please try first before speculating" comments, then I need to ask you, WHAT did you try before asking others how to change the default gamma? Did you TRY editting a config file as I suggested to you in my previous post? Are you going to try that? Or are you asking OTHERS to try it for you and TELL you if it worked or not? Around here we have a saying about "glass houses" and "throwing stones". You should look it up... It looks like you need to read the README and source code yourself (or convince somebody ELSE to do it for you). I do not have time to read it for you to answer your question, mostly because your attitude implied by your reply has gotten me angry now and it is interfering with my serenity.

[aliabbasjp]

Sorry for the terse reply . But you should understand that i dont bother about the technical details of how gamma works. I only wanted a solution to darken my text by default.