It would be great if
Image.Options.Crop.crop_focus()could have a focal point{x_percent, y_percent}
Great suggestion and happy to do that. Will get that out the door this weekend.
The process will be a little more expensive since Image.thumbnail/3 doesn’t take that option natively. So basically I will crop from the provided centre-point and then set the :centre option to :focus to get the result you’re after.
I think there is an issue with the typespec here. When calling
Image.write!(vips_image, :memory, suffix: ".png")
a binary is returned, the spec states than an %Vix.Vips.Image is returned.
Maybe I’m using it wrong, but this works (but dialyzer unhappy).
vips_image |> Image.write!(:memory, suffix: ".png") |> Base.encode64()
Fixed on main branch if you’re willing to try it from there. I have a couple of additional tests and then will publish an update to hex. Thanks for pointing out the issue.
You missed the spec for Image.write! which still states that Vimage.t() | no_return() is returned. I changed the code to use write() and dialyzer is happy. (As am I, very nice lib!)
I know I’m asking for the moon and the stars 
Is there a way to put text on an image within a bounding box?
Let’s say, I need to add a caption on top of an image in the lower half of it, but I don’t know beforehand how long the text is? Basically, best fit caption from ImageMagick?
Definitely possible to do, will need a few hours to get back with the details (day job getting in the way). Might be a bit tricky to auto-size the text to make it fit in a bounding box. But putting text in a bounding box - can do.
libvips does best-fit by default. For example, using vips CLI
$ vips text out.png "This text is resized to best fill the space given." --width 320 --height 140 --rgba
I think you just have to map width and height options to Image lib.
