Only PNG images can be added by a script?

nowell

I’m working on a script that, among other things, sets the image for a glyph. Based on this thread with @cj and @frederik, I’m using the following function:

CurrentGlyph().addImage( replacementImageFilePath )

Unfortunately, I receive an error unless the image at that file path is a PNG. The error message is long, but ends with:

...
AssertionError: Image does not begin with the PNG signature

I have the same image file in both JPG and PNG formats, but only the PNG will load error-free. I’m surprised to see this, because JPG and TIFF are supported for dragged-in images. Do images loaded by script need to be PNGs?

frederik

in the upcoming RF3.3!!!

nowell

Thanks, @frederik and @gferreira! After a good deal of trial and error (this is my first sizable Robofont script), I was able to get this working. Any idea when the PNG converter will move to mojo.tools? Thanks!

gferreira

hello @nowell,

here’s a script which can import images in JPEG or TIFF formats:

import os
# will move to mojo.tools!
from lib.tools.misc import imagePNGData

imagePath = 'example.jpg'
glyph = CurrentGlyph()
glyph.addImage(data=imagePNGData(imagePath))

the script is using an internal function from the lib to convert the image to PNG – this is usually not advised, because the lib may change and the script will stop working. the function imagePNGData will be moved to mojo.tools in a future release.

frederik

yes, PNG only, following the UFO spec

see http://unifiedfontobject.org/versions/ufo3/images/

If you use a drag and drop of any image (png, tiff, jepg) in a glyph window it will be converted internally to a png.

If you are using a script to add an image, you have to be sure the image is png or convert it to an png!

hope this makes sense and good luck!

SOLVED Only PNG images can be added by a script?