IndexError - index 254 out of bounds for axis 0 with size 6

[distant-storm]

I am running the spectra6 examples and expected to everything to just work out of the box.
I can run the stripes example with the default shipping image included with the examples, but it gives the below error.

Detected Spectra 6 7.3 800 x 480 (E673)
Traceback (most recent call last):
File "/home/web/inky/examples/spectra6/image.py", line 31, in
inky.set_image(resizedimage, saturation=saturation)
File "/home/web/.local/lib/python3.9/site-packages/inky/inky_e673.py", line 322, in set_image
self.buf = remap[numpy.array(image, dtype=numpy.uint8).reshape((self.rows, self.cols))]
IndexError: index 254 is out of bounds for axis 0 with size 6

The comic.py also gives this error.
I normally think it is something I have done, but would expect these to work out of the box. Maybe not the comic one if images are some permutation not known, but at least the example shipping one.

I saw some spectra branches on the repo but nothing indicating that I should switch to them.
Any ideas?

[Gadgetoid]

It looks like a palette-mode image is being used with colours outside of the supported range of Inky Frame.

I can create a dummy image that fails using the following code:

from PIL import Image

img = Image.new("P", (800, 480))

for x in range(256):
    for y in range(256):
        img.putpixel((x, y), (x, 0, 0))

img.save("test.png")

I have a suspicion that #221 will probably fix this.

[distant-storm]

It looks like a palette-mode image is being used with colours outside of the supported range of Inky Frame.

I can create a dummy image that fails using the following code:

from PIL import Image

img = Image.new("P", (800, 480))

for x in range(256):
for y in range(256):
img.putpixel((x, y), (x, 0, 0))

img.save("test.png")
I have a suspicion that #221 will probably fix this.

The thing that really confuses me is that it came out the box with the shipping image on and it looks great.
I ran the stripes example, then thought running image.py with image in /Pimoroni/inky/examples/spectra6/images/shipping-picture-inky7.jpg
would actually put it back to how it was, because it is in the spectra6 directory.
So if the colours are wrong, why is there a broken code/images in the spectra6 directory, how did that get merged in?

[distant-storm]

and the official guides say it is as simple as, so either the guides change to say, it's all broken or I have a weird obscure error?
Is AI correct in saying that the original shipping container image is flashed and not converted from an image and that's why it looks good?
I have tried using GIMP and switching the image mode to indexed using the colours, it looks better but still not great.

[Gadgetoid]

Is AI correct in saying that the original shipping container image is flashed and not converted from an image and that's why it looks good?

The original shipping image is loaded using the same code in this library- it's an RGB image which is converted/dithered/quantized to the 6-colour palette for Inky. What does yours look like when you load it?

[distant-storm]

Is AI correct in saying that the original shipping container image is flashed and not converted from an image and that's why it looks good?

The original shipping image is loaded using the same code in this library- it's an RGB image which is converted/dithered/quantized to the 6-colour palette for Inky. What does yours look like when you load it?

I can't see that being possible.

So here is the sequence

• Took it out of the box and was impressed with the shipping containers image already on it and the colours.
• I cloned the repo, ran the install script.
• In the examples/spectra 6 I ran python stripes.py

Fantastic seems to work

Then ran python image.py --file .images/shipping-picture-inky7.jpg
but get the below error. This suggests that the image shipped with the repo in the spectra6 isn't colour indexed to patch the colours on the eink screen.

Detected Spectra 6 7.3 800 x 480 (E673) Traceback (most recent call last): File "/home/webdev/Pimoroni/inky/examples/spectra6/image.py", line 31, in <module> inky.set_image(resizedimage, saturation=saturation) File "/home/webdev/.local/lib/python3.9/site-packages/inky/inky_e673.py", line 322, in set_image self.buf = remap[numpy.array(image, dtype=numpy.uint8).reshape((self.rows, self.cols))] IndexError: index 254 is out of bounds for axis 0 with size 6

Ok so I thought id use gimp to index the colours to the inky screen. None of the repos branches seem to update to add the new file for the 6 colour so just got cursor to generate it.
The image from GIMP looks like the one I think I saw when the screen arrived ( See below image )

Still no joy

I snooped around the branches and saw one relating to spectra colours
main...patch/spectra-colours
this seems to fix the constant in one place but not the other, so I though ok I will fix that on mine and see what happens

Still not correct.

Id understand if it was shipped and the guides said 'image python is currently broken for spectra 6' but that isn't the case.
No one could have run these commands and got that image from it that it came with as it due to the image colours and the scripts not working.

Any help appreciated to stop me going insane.

[Gadgetoid]

I genuinely have no idea what on earth is going on with your display - cc @thirdr am I going insane?

Whats especially confusing is that the shipping image is a jpg which does not support palette colours, so it must be getting converted/quantized to the correct 6-colour palette. The error make no sense and I could not replicate it without using a different, deliberately paletted-with-more-than-six-colours PNG image.

Could be a PIL issue I suppose 🤔

[Gadgetoid]

It's been noted that the image you posted with the wrong colours looks like the screen has stopped refreshing a few seconds into its full update cycle. How long did it take to display?

[distant-storm]

It's been noted that the image you posted with the wrong colours looks like the screen has stopped refreshing a few seconds into its full update cycle. How long did it take to display?

This actually helped ! It prompted me to try a different Pi, so I used a zero 2 but in the process had to flash another card. Followed the instructions and actually used OS Bookworm and it worked perfectly out of the box.
Swapped back to the old pi with same OS and still worked. I think my other card was running a different variant of PI OS like lite.