Colour Manipulation

[Graham Samuel]

Yes I agree wholeheartedly with Johnathan -

I once (maybe five years ago) wanted to use ImageMagick but was put off, partly because I wanted to put it into a commercial product and couldn’t understanding the licensing rules: in particular, it seemed that I had to give all my users (purchasers) access to IM somehow, including the source code… I could never understand how to do this cleanly. That, and the (to me) astonishingly hard to use interface, coupled with zero support, made me think the whole thing was a non-starter. I wonder what people think now. By “people” I mean those of us who really don’t want to step at all far out of the LiveCode comfort zone, even to do a bit of command-line tweaking. Oh, and want their solutions cross-platform.

Graham

> On 19 Mar 2017, at 04:48, Jonathan Lynch via use-livecode <use-livecode at lists.runrev.com> wrote:
> 
> 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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