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Re: Help with PHP BD imaging functionality [message #182487 is a reply to message #182486]

Thu, 08 August 2013 12:01

Ed Jay
Messages: 7
Registered: August 2013

Karma:

Junior Member

The Natural Philosopher wrote:

> On 08/08/13 00:53, Ed Jay wrote:
>> I'm trying to highlight a portion of a grayscale image, with the
>> highlighting color applied to pixels within a range of level only. I'm not
>> getting the result I seek.
>>
>> While the grayscale values within the range possibly yield the highlight
>> color, the entire image is masked with the color from the last
>> imagecolorallocate.
>>
>> My code follows, and the 'Process of interest' is the offending culprit.
>>
>> How do I highlight the value-region of interest with the background of my
>> choosing?
>
> is the problem less that you don't know how to make GD do what you want,
> then you don't actually know how to do what you want at all?

A massive sprinkling of each...
>
> Is what you want covered by this?

I already considered it a possibility, but it intuitively didn't strike me
as the best method available. Is it the only method available to
accomplish my goal?
>
> http://www.php.net/manual/en/image.examples.merged-watermark.php
>
>> //Process of interest:
>>
>> for($x=0; $x<$width; $x++){
>> for($y=0; $y<$height; $y++){
>>
>> $gray =(imagecolorat($final,$x,$y) >> 16) & 0xFF;
>> if (($gray > $gray_threshold) && ($gray < $gray_top)) {$gray =
>> $highlight_color;}
>> $gray2 = imagecolorallocate($final,$gray,$gray,$gray);
>> imagesetpixel($final, $x,$y,$gray2);
>>
>> }
>> }
>>

--
Ed Jay (remove 'M' to reply by email)

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[Message index]

		Help with PHP BD imaging functionality By: Ed Jay on Wed, 07 August 2013 23:53
		Re: Help with PHP BD imaging functionality By: The Natural Philosoph on Thu, 08 August 2013 07:58
		Re: Help with PHP BD imaging functionality By: Ed Jay on Thu, 08 August 2013 12:01
		Re: Help with PHP BD imaging functionality By: The Natural Philosoph on Thu, 08 August 2013 13:12
		Re: Help with PHP BD imaging functionality By: Christoph Michael Bec on Thu, 08 August 2013 23:13
		Re: Help with PHP BD imaging functionality By: Jerry Stuckle on Thu, 08 August 2013 12:55

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