How do I insert a picture as embedded in a cell ? about libxlsxwriter

[jmcnamara]

When you perform this action in Excel it scales the image to fit the cell.

It is also possible with libxslxwriter to scale images (using worksheet_insert_image_opt(). However, there aren't any helper functions to scale it to a cell/pixel size. I had planned to do this at some stage but I didn't get around to it.

You can do it yourself by using some library to get the X and Y pixel size of the the image and also the X and Y DPI. There are internal functions to do this in libxslxwriter but they aren't public.

After that you need to scale the image (using the dimensions and DPI) to the pixel size of the cell. There is some code for that in the Rust version of the library that I wrote. See here.

[jmcnamara]

Have you looked into implementing this feature yet?

Yes. I started working on it in December but then got sucked into some work on rust_xlsxwriter. I made some progress on the Metadata and RichValue files but there is still quite a bit to do. I'll start working on it again next week after the 0.62.0 release of rust_xlsxwriter but I can't give a timeline.

[jmcnamara]

Just a note that I've made some progress on this. I've implemented this feature in the Python and Perl versions of the library (XlsxWriter and Excel::Writer::XLSX). Next up I will implement it in the Rust version rust_xlsxwriter and then I will move on to the C version libxlsxwriter.

https://xlsxwriter.readthedocs.io/worksheet.html#embed_image

[jmcnamara]

Will this feature be an option for the worksheet_insert_image_buffer_opt function?

Yes. Probably.

[zhjr2019]

ok, thank you, I hope to add this feature in the future.

[sunilsabraham]

@jmcnamara : The author is asking how to embed picture in cell. In latest excel there are 2 options to insert picture.

1. place in cell
2. place over cells
   The first option is to embed picture in cell which automatically scale the picture by excel. The second once is the current one implemented by libxlswriter. Is it possible to add the first option as well. Hope you can implement it asap. Thanks.

[jmcnamara]

@sunilsabraham Could you attach an Excel example with an image embedded in a cell and a similar example with an image just inserted, and not embedded, for reference.

[sunilsabraham]

@jmcnamara Please see the screen shot below. Just open excel and try to insert a picture and you will get 2 options. first one is to embed picture to a cell and excel will automatically scale the image. second one is to place image over a cell and that is the current implementation in libxlswriter. Old excel had only place over a cell may be upto 2016 version. If you can implement the embed in cell that would be great. so we dont need to scale the image and it automatically does according to row height etc. I am attaching an example file as well.

Book1.xlsx

[jmcnamara]

@sunilsabraham Thanks for pointing that out. That is a useful feature. I'll try add it.

[sunilsabraham]

Thanks.

[rickabitdigital]

@jmcnamara I'd love the Place in cell feature too! Images placed in cells will scale according to column width/row height. As we can define the initial column width and row height, to accommodate our inserted images, cells shoudn't be hidden on file open. I think this produces a more natural and robust layout behaviour - e.g. when objects float over cells users can struggle with the overlap.

[rickabitdigital]

Hi @jmcnamara
Have you looked into implementing this feature yet?

I've been reading the openxml API reference docs (my first time), but the 'place in cell' xml format is not immediately obvious. So I have begun using an OOXML editor/viewer to see the difference between images placed in cells using typical drawing references vs an image embedded in a cell.
I'll let you know if I get anywhere.
If there's any way you can think of me helping advance this feature please could you advise?
thank you.

[rickabitdigital]

Hi John,
That's great to hear and thank you very kindly for the update. Much appreciated.
I have just reached the point where the basic OOXML viewer I found wasn't showing me the RichValue relationship for an image placed in cell for me to compare with the XML of the existing drawing relationships for image objects.
I suppose I may need to give in and use the obvious OOXML explorer for VSCode.
I'll keep going with my learning and appreciate any time you find to work on this.

[slw287r]

Snippets to get image dimensions and DPIs for in-cell embedding.

https://github.com/slw287r/imgt/blob/main/imgt.c

[jmcnamara]

Snippets to get image dimensions and DPIs for in-cell embedding.

Note, there is already code like that in the library: https://github.com/jmcnamara/libxlsxwriter/blob/main/src/worksheet.c#L3885

It isn't public, by default, and I could make it public but the feature request is for a newer type of embedded image feature in Excel.

[rickabitdigital]

Hi John,
I'm creating sheets and images in memory - in your C Library.
Will this feature be an option for the worksheet_insert_image_buffer_opt function?