Colour Manipulation

[jonathandlynch at gmail.com]

It would be amazing if the LC folks created an ImageMagick wrapper so that we could use it as an external or widget!

Sent from my iPhone

> On Mar 18, 2017, at 11:30 PM, Mike Bonner via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> You could write a small app just to do the processing (or use a web server
> with an lc script to process) break it into chunks, and spawn
> processes/server requests to offload the work maybe. Though imagemagick
> would be a pretty awesome solution if it can be made to do what you need.
> 
> On Sat, Mar 18, 2017 at 4:02 PM, Jonathan Lynch via use-livecode <
> use-livecode at lists.runrev.com> wrote:
> 
>> You could put the entire ImageMagick set of files into custom properties,
>> then, when your app first opens, look to see if ImageMagick is present. If
>> not, then have your app save the ImageMagick files in the same folder as
>> your app.
>> 
>> I have done that sort of thing before -  big files, but works fine.
>> 
>> If you can find a Javascipt library that does what you need, your mission
>> would be easy :)
>> 
>> Sent from my iPhone
>> 
>>> On Mar 18, 2017, at 5:03 PM, jonathandlynch at gmail.com wrote:
>>> 
>>> With 10 million pixels, comparing 3 different base colors (RGB), and
>> checking both upper and lower bounds, that comes to 60 million comparisons.
>> That is an awful lot for a scripted environment.
>>> 
>>> You would need to make an external (and, frankly, the LC instructions on
>> making desktop externals do not work for modern versions of LC and Visual
>> Studio).
>>> 
>>> For a project, I was able to successfully use ImageMagick as a command
>> line image processor. It took a few seconds, but much better than what LC
>> took.
>>> 
>>> ImageMagick is pretty flexible and might give you what you need. I was
>> using it for green screen image extractions.
>>> 
>>> Sent from my iPhone
>>> 
>>>> On Mar 18, 2017, at 2:20 PM, Peter Reid via use-livecode <
>> use-livecode at lists.runrev.com> wrote:
>>>> 
>>>> I've got an app that allows the user to display an image using a
>> variable number of colours (2-24 colours).  In addition, the user can
>> specify upper and lower thresholds so that all pixels below a specified
>> value are displayed using a colour such as black and all pixels with values
>> above a specified value are displayed using a colour such as red.  Pixels
>> with values between the thresholds are displayed using the specified colour
>> range of 2-24 colours. The images can consist of up to 8-10 million pixels,
>> they are rectangular and can be in a landscape or portrait orientation.
>>>> 
>>>> Whilst I have this working the code that manages the changing of the
>> number and use of colours in an image is rather slow.  This is despite me
>> using the "repeat for each" loop structure and lock the screen wherever
>> possible to get the maximum speed!
>>>> 
>>>> Does anyone have any clever algorithms, code, add-ons, etc. that can do
>> this kind of thing in a flash?!
>>>> 
>>>> Thanks
>>>> 
>>>> Peter
>>>> --
>>>> Peter Reid
>>>> Loughborough, UK
>>>> 
>>>> 
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