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michal-h21 / tex4ebook

Converter from LaTeX to ebook formats (epub, mobi). Using tex4ht and texlua scripts.
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Using \coverimage with an SVG results in bizarrely cropped cover image #72

Open DavidGriffith opened 4 years ago

DavidGriffith commented 4 years ago

I can't put a finger on exactly what causes this, but now that I found it, I can't seem to create a demo EPUB that results in a correctly-rendered cover. The problem is that if I do \coverimage{cover.svg}, an epub reader will render the cover strangely cropped. Sometimes it was a strip off the bottom. More recently three quarters of the SVG is removed. If I do \coverimage{cover.png}, the image appears as it should.

To recreate a misbehaving EPUB, do tex4ebook -xs -f epub3 -c badcover.cfg badcover.tex:

% badcover.tex
\documentclass[12pt]{book}
\usepackage{graphicx}
\usepackage{svg}
\usepackage{lipsum}

\title{Bad Cover}
\author{David Griffith}

\begin{document}
\coverimage{badcover.svg}
\maketitle
\tableofcontents

\chapter{Hello}
\lipsum[1]
\chapter{Goodbye}
\lipsum[1]
\chapter{Hello Again}
\lipsum[1]
\chapter{Whee!}
\lipsum[1]
\end{document}
% badcover.cfg
\Preamble{xhtml}
\Configure{UniqueIdentifier}{661.org}
\DeclareGraphicsExtensions{.svg,.png,.jpg,.gif}
\renewcommand\includesvg[2][]{\includegraphics{#2}}
\Configure{CoverMimeType}{image/svg+xml}
\begin{document}
\EndPreamble

Here's how Calibre renders the bad graphic: Screenshot at 2020-06-27 00-29-40

Here's the SVG: badcover.zip

Here's the PNG as created with convert badcover.svg badcover.png: badcover

michal-h21 commented 4 years ago

This is strange, it works correctly on my machine. This is my <img> element in badcover.html:

  <img src="badcover.svg" alt="PIC"  />

Maybe you have some additional attributes here?

DavidGriffith commented 4 years ago 
<body 
>
   <div class="cover-image"> 
 <img 
src="badcover.svg" alt="PIC"  
 /></div>
michal-h21 commented 4 years ago

So this is the same. Maybe it is a bug in (or feature?) in Calibre? It seems that it crops the image only in the library view, it displays it correctly when I open the book in ebook-viewer.

DavidGriffith commented 4 years ago

Alkdiko on Android does this too.

Here's the bad epub so we can see if this renders poorly for you. badcover-epub.zip