Re: Resolution of LaTeX fragments

[Carsten Dominik <dominik@science.uva.nl>]

Hi Daniel,

thanks for your patch, and for looking into this.

There is already a parameter in org-mode to change the size of the 
images: the variable org-format-latex-options contains several 
parameters for creating the LaTeX images, and one of them is `:scale' - 
the default is 1.0, but you can set it to 1.5 or 2.0 to increase the 
the size.

Having said that, maybe it is a good idea to allow changing the 
resolution - but the main purpose of this parameter would be to improve 
the *quality* when printing.

- Carsten

On Sep 1, 2006, at 23:50, Daniel J. Sinder wrote:

> I've encountered a problem with LaTeX fragments: the default
> resolution that dvipng produces results in text (in the images)
> which is too small. Of course, browsers (eg, firefox) can manipulate
> font size from the client side, but that doesn't affect images (and
> changing the relative size of the two). Monitor resolution is also a
> factor. Uugh. I guess mixing text with images containing text is not
> really ideal, but I'll put that aside for now.
>
> I don't have a great solution for this, but I needed something to
> make it usable. I've added a little hack that creates a variable,
> org-export-LaTeX-fragments-resolution, that is used in the call to
> dvipng. I've found that a setting of 150 is much easier on my eyes
> than the default (which I've estimated to be ~86). I added something
> to org-export-plist-vars for publishing too, but that doesn't seem
> to work -- not sure why (I'm new to Elisp).
>
> The patch is attached in case anyone else was looking for a fix for
> this.
>
> Dan
>
>
> --- org-orig.el	2006-09-01 14:36:16.000000000 -0700
> +++ org.el	2006-09-01 13:38:30.000000000 -0700
> @@ -1985,6 +1985,12 @@
>    :group 'org-latex
>    :type 'boolean)
>
> +(defcustom org-export-LaTeX-fragments-resolution 86
> +  "Output resolution of images created by conversion of LaTeX 
> fragments when exporting to HTML."
> +  :group 'org-export-translation
> +  :group 'org-latex
> +  :type 'integer)
> +
>  (defcustom org-export-with-fixed-width t
>    "Non-nil means, lines starting with \":\" will be in fixed width 
> font.
>  This can be used to have pre-formatted text, fragments of code etc.  
> For
> @@ -13110,6 +13116,7 @@
>      (:sub-superscript      . org-export-with-sub-superscripts)
>      (:TeX-macros           . org-export-with-TeX-macros)
>      (:LaTeX-fragments      . org-export-with-LaTeX-fragments)
> +    (:LaTeX-resolution     . org-export-LaTeX-fragments-resolution)
>      (:fixed-width          . org-export-with-fixed-width)
>      (:timestamps           . org-export-with-timestamps)
>      (:tables               . org-export-with-tables)
> @@ -15532,6 +15539,7 @@
>        (call-process "dvipng" nil nil nil
>  		    "-E" "-fg" fg "-bg" bg
>  		    "-x" scale "-y" scale "-T" "tight"
> +		    "-D" (number-to-string org-export-LaTeX-fragments-resolution)
>  		    "-o" pngfile
>  		    dvifile)
>        (if (not (file-exists-p pngfile))
>
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