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comp / comp.mobile.android / Re: ebook reader - image scaling ?

SubjectAuthor
* ebook reader - image scaling ?R.Wieser
+* Re: ebook reader - image scaling ?Newyana2
|`* Re: ebook reader - image scaling ?R.Wieser
| `* Re: ebook reader - image scaling ?Newyana2
|  `* Re: ebook reader - image scaling ?R.Wieser
|   `* Re: ebook reader - image scaling ?Newyana2
|    `* Re: ebook reader - image scaling ?R.Wieser
|     `* Re: ebook reader - image scaling ?Andy Burns
|      `- Re: ebook reader - image scaling ?R.Wieser
`- Re: ebook reader - image scaling ?Carlos E.R.

1
Subject: ebook reader - image scaling ?
From: R.Wieser
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Thu, 30 May 2024 09:02 UTC
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: address@is.invalid (R.Wieser)
Newsgroups: comp.mobile.android
Subject: ebook reader - image scaling ?
Date: Thu, 30 May 2024 11:02:08 +0200
Organization: A noiseless patient Spider
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Hello all,

In a previous thread I mentioned I found the below ebook-reader :

https://f-droid.org/en/packages/com.github.axet.bookreader/

Currenly I've added an image (by hand) and am trying to get it to stretch to
half a smartphones screen width. But no matter what I try (and which works
in a HTML page on a PC(1) ) I can't find how to make that happen.

(1) 'width=50%', 'width="50%"', 'style="width:50%;"' and using a CSS file.

Question:
Am I supposed to be able to resize images in an epub(2), and if so how is
that done ?

(2) the above epub reader does have "scale image(s) to fill the screen"
option though, but thats not quite what I was after.

Regards,
Rudy Wieser

Subject: Re: ebook reader - image scaling ?
From: Newyana2
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Thu, 30 May 2024 12:02 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: newyana@invalid.nospam (Newyana2)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Thu, 30 May 2024 08:02:48 -0400
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On 5/30/2024 5:02 AM, R.Wieser wrote:
> Hello all,
>
> In a previous thread I mentioned I found the below ebook-reader :
>
> https://f-droid.org/en/packages/com.github.axet.bookreader/
>
> Currenly I've added an image (by hand) and am trying to get it to stretch to
> half a smartphones screen width. But no matter what I try (and which works
> in a HTML page on a PC(1) ) I can't find how to make that happen.
>
> (1) 'width=50%', 'width="50%"', 'style="width:50%;"' and using a CSS file.
>
> Question:
> Am I supposed to be able to resize images in an epub(2), and if so how is
> that done ?
>
> (2) the above epub reader does have "scale image(s) to fill the screen"
> option though, but thats not quite what I was after.
>

You seem to have only half the story here. You're making
your own epub file as HTML and CSS in a ZIP? I don't understand
the syntax above.

HTML: <IMG WIDTH=50% HEIGHT=50%> (it also works with quotes: "50%")
Or <IMG STYLE="width: 50%; height: 50%;">
Or in either a STYLE block or a CSS file: IMG {width: 50%; height: 50%;}

And you can also use an ID:

<STYLE>
#Bigpic {width: 50%; height: 50%;}
</STYLE>
</HEAD>
<BODY>

<IMG ID="Bigpic">

I don't know of anywhere you might use apostrophes other than
inside javascript.

Subject: Re: ebook reader - image scaling ?
From: Carlos E.R.
Newsgroups: comp.mobile.android
Date: Thu, 30 May 2024 12:59 UTC
References: 1
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From: robin_listas@es.invalid (Carlos E.R.)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Thu, 30 May 2024 14:59:36 +0200
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On 2024-05-30 11:02, R.Wieser wrote:
> Hello all,
>
> In a previous thread I mentioned I found the below ebook-reader :
>
> https://f-droid.org/en/packages/com.github.axet.bookreader/
>
> Currenly I've added an image (by hand) and am trying to get it to stretch to
> half a smartphones screen width. But no matter what I try (and which works
> in a HTML page on a PC(1) ) I can't find how to make that happen.
>
> (1) 'width=50%', 'width="50%"', 'style="width:50%;"' and using a CSS file.
>
> Question:
> Am I supposed to be able to resize images in an epub(2), and if so how is
> that done ?
>
> (2) the above epub reader does have "scale image(s) to fill the screen"
> option though, but thats not quite what I was after.

In my hardware ebook reader, images in epubs behave "weird". I have to
double tap on the image (this switches to "image viewer mode"), and then
I can zoom it. And sometimes I have to insist, not always it works.

--
Cheers, Carlos.

Subject: Re: ebook reader - image scaling ?
From: R.Wieser
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Thu, 30 May 2024 13:57 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: address@is.invalid (R.Wieser)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Thu, 30 May 2024 15:57:06 +0200
Organization: A noiseless patient Spider
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Newyana2,

> You seem to have only half the story here. You're making
> your own epub file as HTML and CSS in a ZIP? I don't understand the syntax
> above.

Ah, my apologies. I ment that I added an image to a page in an existing
epub (and added a CSS file and updated the "content.opf").

> HTML: <IMG WIDTH=50% HEIGHT=50%> (it also works with quotes: "50%")
> Or <IMG STYLE="width: 50%; height: 50%;">
> Or in either a STYLE block or a CSS file: IMG {width: 50%; height: 50%;}

Thats the thing - all that stuff that works in an HTML file doesn't seem to
want to work in an EPUB. :-(

> (it also works with quotes: "50%")

Make that "it *only* works with".

> And you can also use an ID:

Or a class. Yes, I tried that too. I even tried to to put a "style="
attribute into the image tag itself. Nothing worked.

Regards,
Rudy Wieser

Subject: Re: ebook reader - image scaling ?
From: Newyana2
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Thu, 30 May 2024 22:01 UTC
References: 1 2 3
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Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Thu, 30 May 2024 18:01:36 -0400
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On 5/30/2024 9:57 AM, R.Wieser wrote:

>
>> (it also works with quotes: "50%")
>
> Make that "it *only* works with".
>
Officially attributes are supposed to be in quotes if non-numeric.
Some people even put numbers in quotes. It works either way.
I just tested it on IE and FF.

>> And you can also use an ID:
>
> Or a class. Yes, I tried that too. I even tried to to put a "style="
> attribute into the image tag itself. Nothing worked.

Interesting. I've never dealt with an ebook reader.
I guess it's not the same as basic HTML, even though
it claims to be.

Subject: Re: ebook reader - image scaling ?
From: R.Wieser
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Fri, 31 May 2024 08:07 UTC
References: 1 2 3 4
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From: address@is.invalid (R.Wieser)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Fri, 31 May 2024 10:07:55 +0200
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Newyana2,

>>> (it also works with quotes: "50%")
>>
>> Make that "it *only* works with".
>>
> Officially attributes are supposed to be in quotes if non-numeric.
> Some people even put numbers in quotes. It works either way.
> I just tested it on IE and FF.

Yes, it does work on FF.

But you overlooked one thing : my question was about *epub*, not a
webbrowser. Any information about how it does work on something else is
currently of little, if any, value to me.

> Interesting. I've never dealt with an ebook reader.
> I guess it's not the same as basic HTML, even though
> it claims to be.

"basic HTML" ? Never heard of that.

FYI, the html variant used in epub's is called XHTML (as I found yesterday).
Its a bit more strict than the HTML implemented in webbrowsers. Including
that *all* arguments to attributes need to be in double-quotes, regardless
of if they are values or not.

I found that out when I tried to make an image appear bigger using
"width=100%" (no double-quotes around the "100%") causing he rest of the
page to disappear. :-|

As for the "its different" part ? There are two parts to that. One of them
being that tried HTML in an app which expected XHTML, and the second part
being that I have no idea if the epub-reader app I installed displays the
ful range of allowed XHTML tags or just subset of them. For instance, I
can't get a "<hr/>" to display.

If you come across information which describes which XHTML tags an EPUB
should display (and perhaps how) than to tell, as I could not find anything
of the kind.

Regards,
Rudy Wieser

Subject: Re: ebook reader - image scaling ?
From: Newyana2
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Fri, 31 May 2024 12:40 UTC
References: 1 2 3 4 5
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From: newyana@invalid.nospam (Newyana2)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Fri, 31 May 2024 08:40:31 -0400
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On 5/31/2024 4:07 AM, R.Wieser wrote:

> "basic HTML" ? Never heard of that.
>
HTML is official and defined. There are versions, but it's
defined. Part of the original intention was to make it available
and relatively easy to use. So interpreters are designed to make
the best of what they get. If you make a syntax error in CSS
then the whole thing wil fail from that point on. The parser just says
"fuck this!" at the first irregularity. With HTML the browser will try
to display as best it can.

> FYI, the html variant used in epub's is called XHTML (as I found yesterday).
> Its a bit more strict than the HTML implemented in webbrowsers. Including
> that *all* arguments to attributes need to be in double-quotes, regardless
> of if they are values or not.
>

I wasn't familiar with XHTML. Wikipedia says it's actually a variant
of XML rather than HTML. And there have been numerous versions.
As near as I can tell, all this is a general trend toward developing
standards that are extremely rigid: easy for automating software but
hard for hand-coders. Wikipedia says the latest XHTML, v. 5, is designed
for use with web apps; the developers viewed XHTML 2 as "too
document oriented". (v. 2 apparently went to v. 5.)

This looks like a rehashing of the XML fad and then the JSON fad:
Very complicated ways of storing data that only a machine could love.
It's faddish because the people using it are not actually working
with it directly. They're using WYSIWYG tools where they can just plug
in copy, images, etc, and the software will write the code.

So I guess you'd need to figure out what version of XHTML you have
and then get the docs for it. I'd look myself if I were curious, but to
my mind life's too short for XML, XHTML and JSON. And too short for
ebooks, too, for that matter. :) Though I actually wrote a simple VBS
JSON parser in order to use REST API map functions from Google and
Bing. JSON seemed less distasteful than XML, and it wastes a lot less
bytes in its rigidity.

> For instance, I
> can't get a "<hr/>" to display.

Isn't that "<hr />" ? This is crazy stuff. Heavy quoting. Case sensitive.
Case sensitivity is another thing that's good for machines but not for
human readability. With XHTML it seems to mean the same thing it means
in C++
and javascript: Virtually all keywords and variables will be lowercase,
making
the code flow harder to read, but occasional uppercase elements are thrown
in to keep you on your toes.

Subject: Re: ebook reader - image scaling ?
From: R.Wieser
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Fri, 31 May 2024 13:18 UTC
References: 1 2 3 4 5 6
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: address@is.invalid (R.Wieser)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Fri, 31 May 2024 15:18:10 +0200
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Newyana2,

> So I guess you'd need to figure out what version of XHTML you have and
> then get the docs for it.

:-) Yep, thats what I've been trying to do. Even the "basic XHTML" docs
would help.

I did find /some/ info about it, but as it shows "HR" as supported, but as
the epub-reader doesn't display it (but luckily doesn't abort parsing
either) ...

>> For instance, I can't get a "<hr/>" to display.
>
> Isn't that "<hr />" ?

While googeling I came across info that said that the space infront of that
slash is just there so old webbrowsers would not barf. IOW, its not needed
for XHTML (or for the more modern variants of HTML/webbrowsers).

Regards,
Rudy Wieser

Subject: Re: ebook reader - image scaling ?
From: Andy Burns
Newsgroups: comp.mobile.android
Date: Fri, 31 May 2024 13:31 UTC
References: 1 2 3 4 5 6 7
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Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
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R.Wieser wrote:

> Newyana2 wrote:
>
>> So I guess you'd need to figure out what version of XHTML you have and
>> then get the docs for it.
>
> :-) Yep, thats what I've been trying to do.

<https://www.w3.org/TR/epub>

Subject: Re: ebook reader - image scaling ?
From: R.Wieser
Newsgroups: comp.mobile.android
Organization: A noiseless patient Spider
Date: Fri, 31 May 2024 14:34 UTC
References: 1 2 3 4 5 6 7 8
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: address@is.invalid (R.Wieser)
Newsgroups: comp.mobile.android
Subject: Re: ebook reader - image scaling ?
Date: Fri, 31 May 2024 16:34:08 +0200
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Andy,

>>> So I guess you'd need to figure out what version of XHTML you have and
>>> then get the docs for it.
>>
>> :-) Yep, thats what I've been trying to do.
>
> <https://www.w3.org/TR/epub>

I found a few myself :

http://idpf.github.io/epub3-samples/30/samples.html

https://idpf.github.io/epub-cmt/v3/

https://www.w3.org/publishing/epub32/epub-contentdocs.html

https://www.w3.org/AudioVideo/ebook/

https://www.w3.org/2010/04/xhtml10-strict.html

https://epubknowledge.com/docs/xhtml-general/

https://www.yourhtmlsource.com/accessibility/xhtmlexplained.html/

..... and somehow none of them actually mention which tags XHTML supports, or
which tags are/must be supported by EPUB books (which I do not automatically
consider to be the same set). :-(

And assuming that there are different XHTML versions that EPUB readers
should support, I have not found any specs to them either.

Regards,
Rudy Wieser

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