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Re: Get the actual width/height of an image
From: |
Corwin Brust |
Subject: |
Re: Get the actual width/height of an image |
Date: |
Mon, 14 Sep 2020 16:18:17 -0500 |
Greetings!
On Mon, Sep 14, 2020 at 3:53 PM Emanuel Berg via Users list for the
GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:
>
> Yuan Fu wrote:
>
> > There doesn’t seem to be a function to get the
> > aspect ratio of the image, or the actual pixel
> > height/width of the image. So can I get
> > this information?
I think we can get the dimensions from `image-size', but note the
PIXELS argument:
(image-size SPEC &optional PIXELS FRAME)
| Documentation
| Return the size of image SPEC as pair (WIDTH . HEIGHT).
| PIXELS non-nil means return the size in pixels, otherwise return the
| size in canonical character units.
| FRAME is the frame on which the image will be displayed. FRAME nil
| or omitted means use the selected frame.
| Calling this function will result in the image being stored in the
| image cache. If this is not desirable, call image-flush after
| calling this function.
> For everything batch and graphics, use ImageMagick.
I think Emacs is moving away from ImageMagick and toward
"self-implemented" image manipulation &ct. functions. Not that IM
has "gotten rusty" -- it isn't preferred from an elisp perspective
which could be important in terms of portability to other Emacsen.
>
> --
> underground experts united
> http://user.it.uu.se/~embe8573
> https://dataswamp.org/~incal
>
>
Regards,
Corwin