$ impressive -c none -a 7 -wxX --nologo -t FadeOutFadeIn -T 750 ~/images/wallpaper

Welcome to Impressive version 0.11.0b
Detected screen size: 1920x1080 pixels
OpenGL renderer: Mesa DRI Intel(R) Bay Trail

===============================================================================
OOPS! Impressive crashed!
This shouldn't happen. Please report this incident to the author, including the
full output of the program, particularly the following lines. If possible,
please also send the input files you used.

Impressive version: 0.11.0b
Python version: 2.7.10 (default, Sep 7 2015, 13:51:49)
[GCC 5.2.0]
PyGame version: 1.9.1release
PIL version: 1.1.7
PDF renderer: None
OpenGL vendor: Intel Open Source Technology Center
OpenGL renderer: Mesa DRI Intel(R) Bay Trail
OpenGL version: 3.0 Mesa 11.0.4
Operating system: Linux 4.1.12-1-ck (x86_64)
Linux distribution: "Arch Linux"
Command line: /usr/bin/impressive -c none -a 7 -wxX --nologo -t FadeOutFadeIn -T 750 /home/iegubkin/images/wallpaper
Traceback (most recent call last):
File "/usr/bin/impressive", line 5905, in run_main
main()
File "/usr/bin/impressive", line 5672, in main
LogoTexture = gl.make_texture(gl.TEXTURE_2D, filter=gl.NEAREST, img=LogoImage)
File "/usr/bin/impressive", line 1229, in make_texture
self.load_texture(target, img)
File "/usr/bin/impressive", line 1242, in load_texture
gl.TexImage2D(target, 0, format, img.size[0], img.size[1], 0, format, self.UNSIGNED_BYTE, img.tostring())
File "/usr/lib/python2.7/site-packages/PIL/Image.py", line 686, in tostring
"Please call tobytes() instead.")
Exception: tostring() has been removed. Please call tobytes() instead.

Perhaps the gentoo developers have already worked around this error?
https://github.com/gentoo/gentoo/blob/master/app-office/impressive/impressive-0.11.0b-r1.ebuild