Re: Scaling of image previews in org-mode

[John Kitchin <jkitchin@andrew.cmu.edu>]

Certainly it could be adapted to other modes, at least for showing the
images. If there was a way to parse resizing info, or set it via
variables, you could also get resized images. The key is hooking into
font-lock and detecting where images are. 

The basic framework is laid out here:

http://kitchingroup.cheme.cmu.edu/blog/2016/03/21/Displaying-image-overlays-on-image-filenames-in-Emacs/

That example had imagemagick compiled in, but it could be adapted pretty
readily to use an external imagemagick..


Uwe Brauer writes:

>>>> "John" == John Kitchin <jkitchin@andrew.cmu.edu> writes:
>
>    > I use this code here:
>    > https://github.com/jkitchin/scimax/blob/master/scimax-org.el#L957
>
>    > to provide inline scaling in Emacs when it is not built with imagemagick.
>
> Hi
>
> Could that package or parts of it also be used in other modes?
>
> I have the problem of displaying images in latex buffers (using auctex)
>
> The only available tool I know is iimage.el, but this package does not
> allow to re-seize the displayed image. I asked about it on emacs devel
> and the answer was: «please send a patch or wait», fail enough
>
> I just attach the mail in question below in order to clarify.
>
> ,----
> | 
> | 
> | 
> | I just learnt about iimage.el, which is now part of GNU emacs core. I
> | like it quite a lot, the only thing which I find a bit inconvenient on
> | my 12 inch Laptop is the size of the images displayed. I did not find
> | any variable in which the size of images could be changed.
> | 
> | 
> | The author's address does not work anymore, so I looked at the code it
> | seems that the essential part is this:
> | 
> |   (if arg
> |                   (add-text-properties (match-beginning 0) (match-end 0)
> |                                        `(display ,(create-image file)
> |                                                   ^^^^^
> |                                          modification-hooks
> |                                          (iimage-modification-hook)))
> |             
> | 
> | Now I checked that function and its documentation says
> | ,----
> | [+]
> | | 
> | | create-image is an autoloaded compiled Lisp function in ‘image.el’.
> | | (create-image FILE-OR-DATA &optional TYPE DATA-P &rest PROPS)
> | | Create an image.
> | | ....
> | | Images should not be larger than specified by ‘max-image-size’.
> | `----
> | 
> | 
> | However 
> | ,----
> | [+]
> | | max-image-size is a variable defined in ‘C source code’.
> | | Its value is 10.0
> | `----
> | 
> | So I cannot change that value easily. Anybody has an idea how to change
> | the size of the displayed images?
> | 
> | thanks
> | 
> | Uwe Brauer 
> | 
> `----


-- 
Professor John Kitchin
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