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How to convert simple B/W graphic to the dot matrix for the LED display/sign

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  How to convert simple B/W graphic to the dot matrix for the LED display/sign Petr Jakes <petr.jakes.tpc@gmail.com> - 2012-03-04 02:28 -0800
    Re: How to convert simple B/W graphic to the dot matrix for the LED display/sign Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-03-04 10:54 +0000
      Re: How to convert simple B/W graphic to the dot matrix for the LED display/sign Petr Jakes <petr.jakes.tpc@gmail.com> - 2012-03-04 04:47 -0800
        Re: How to convert simple B/W graphic to the dot matrix for the LED display/sign Max Erickson <maxerickson@gmail.com> - 2012-03-04 14:09 +0000
          Re: How to convert simple B/W graphic to the dot matrix for the LED display/sign Petr Jakes <petr.jakes.tpc@gmail.com> - 2012-03-05 05:53 -0800

#21187 — How to convert simple B/W graphic to the dot matrix for the LED display/sign

I would like to convert simple B/W graphic to the 432x64 pixel matrix.
It is intended to display this graphic on the one color LED matrix
sign/display (432 LEDs width, 64 LEDs height).
I am experimenting with the PIL, but I did not find solution there.

It will be really helpful If somebody here can show me the direction
to go?

Regards
Petr

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#21189

On Sun, 04 Mar 2012 02:28:16 -0800, Petr Jakes wrote:

> I would like to convert simple B/W graphic to the 432x64 pixel matrix.
> It is intended to display this graphic on the one color LED matrix
> sign/display (432 LEDs width, 64 LEDs height). I am experimenting with
> the PIL, but I did not find solution there.
> 
> It will be really helpful If somebody here can show me the direction to
> go?

What file format is the graphic in? How big is it?

What file format do you want it to be?


-- 
Steven

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#21192

> What file format is the graphic in? How big is it?
>
> What file format do you want it to be?
>

Now, I am able to create the png file with the resolution 432x64 using
PIL (using draw.text method for example).

I would like to get the 432x64 True/False (Black/White) lookup table
from this file, so I can switch LEDs ON/OFF accordingly.

--
Petr

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#21198

Petr Jakes <petr.jakes.tpc@gmail.com> wrote:

> 
>> What file format is the graphic in? How big is it?
>>
>> What file format do you want it to be?
>>
> 
> Now, I am able to create the png file with the resolution 432x64
> using PIL (using draw.text method for example).
> 
> I would like to get the 432x64 True/False (Black/White) lookup
> table from this file, so I can switch LEDs ON/OFF accordingly.
> 
> --
> Petr
> 

The convert and load methods are one way to do it:

>>> import Image
>>> im=Image.new('L', (100,100))
>>> im=im.convert('1')
>>> px=im.load()
>>> px[0,0]
0

That's the numeral one in the argument to convert. The load method 
returns a pixel access object.


Max

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#21231

> >>> import Image
> >>> im=Image.new('L', (100,100))
> >>> im=im.convert('1')
> >>> px=im.load()
> >>> px[0,0]

Thanks, load() method works great.

One more question.

Finally, I would like to store array in the database.

What is the best way to store arrays?

Petr

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