Re: Cropping images with fading outline effects, using GD, etc.?

For example, the following imagick function might handle output image 
opacity setting, but, it would still be nice to just handle outline gradual 
fading on one go:
http://www.php.net/manual/en/imagick.setimageopacity.php

Stay well

Jacob Kruger
Blind Biker
Skype: BlindZA
'...fate had broken his body, but not his spirit...'

----- Original Message ----- 
From: "Jacob Kruger" <[email protected]>
To: <[email protected]>
Sent: Wednesday, August 07, 2013 9:46 AM
Subject: [PHP-WIN] Cropping images with fading outline effects, using GD, 
etc.?


I need/want to be able to take either uploaded, or stored image files, and 
crop them into either rectangular, or elliptical pieces/shapes, and am using 
GD library thus far.

The basics are not an issue - for rectangular cropping, imagecopy and 
imagecopyresize, etc. are functions that can handle it easily enough, and in 
terms of elliptical cropping, I am drawing an elliptical shape onto the 
original image using a colour that's unlikely to be part of the original 
image resource, with drawing line thickness set to 2 pixels for now, and 
then I do a form of flood fill to border with that same colour outside the 
ellipsis, and then set that as the transparent colour of the image, before 
copying the relevant part to another image resource as well.

However, it now comes down to that the images to be saved might also need to 
have sort of faded/increasingly transparent outlines, and these would 
generally be photo's, and so, just choosing a single transparent colour 
won't really work too well.

Was thinking simplest will be to in fact take multiple instances of each 
image, with each of them going slightly smaller in terms of width/height, 
and then I could keep them centred on each other, but sort of overlay them 
with the most transparent/faded/widest image instance starting from back, 
and with sort of original colouration/narrowest one being applied to output 
resource last, and this should implement a form of faded/blurred 
outline/edging to output image?

However, it again comes down to trying to decide on best/simplest way to 
apply a form of global transparency filter to an image resource, without 
needing to specify a specific colour each time for something like the 
imagecolourtransparent function, since suppose would need to then figure out 
a way to determine which RGB value would work best per image - and don't 
think that could be made to work consistently either.

In other words, what am really looking for at moment is a way to set the 
opacity of an image resource - and if it comes down to capturing the output 
buffer while using something like imagepng to stream the image resource to 
the buffer, that's not an issue either since am already using a form of that 
to sometimes capture image resource data in another way, but, would need to 
find a way to somehow affect opacity of output stream image then as well.

While I am currently pretty much just using GD library, I would be open to 
other suggestions/workarounds/thoughts on the simplest way to implement 
something like this?

And, if I'm just missing, or haven't come across a simple way to implement 
faded/graded outlines for images, would also like to know that...<smile>

TIA

Jacob Kruger
Blind Biker
Skype: BlindZA
'...fate had broken his body, but not his spirit...'


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