sigmoidalContrastImage

[agriz]

How do i use this function with imagick?

$im->sigmoidalContrastImage(bool $sharpen , float $alpha , float $beta [, int $channel = Imagick::CHANNEL_ALL ]);

How do i replace the values?
Can you give me an example with some numbers?

-sigmoidal-contrast 10,40%
How do i replace this line to sigmoidalContrastImage()

[fmw42]

see http://www.imagemagick.org/Usage/color_mods/#sigmoidal for an explanation of alpha and beta. I would set sharpen to off, at first, since it is not in the command line version.

"Where α is the threshold level, and β the contrast factor to be applied."

so that would be like the command line with -sigmoidal-contrast beta,alpha


http://www.imagemagick.org/script/comma ... l-contrast

[agriz]

Does Imagick have all the commandline equivalent function?

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convert image.jpg -colorspace gray -sigmoidal-contrast 10,40%  -fill "#99cccc" -compose Hardlight  -composite  image.png
convert -size 184x244 xc:transparent image.png  -set option:distort:viewport 184x244   -matte -virtual-pixel transparent  -distort Perspective '0,0,0,39  0,203,36,244  153,0,136,0  153,203,184,224'  -composite  image1.png

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$im->setColorspace(IMGTYPE_GRAYSCALE);
$im->sigmoidalContrastImage(false, 50%,10); // from your reply!

I cant find the equivalent fill function.

//bool Imagick::setImageCompose ( int $compose ) --> WHY int here? Where can i find the integer for Hardlight?

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$im->setImageCompose (HARDLIGHT); ??? 

-composite from the commandline, what happens to that?
In command line itself, what does it do?

There are function for setting the -matte, -virtual-pixel and -distort

How do i create this xc:transparent with widthxheight?

[fmw42]

Does Imagick have all the commandline equivalent function?

No

Where can i find the integer for Hardlight

Hardlight has no value. It is its own value for the compose method.

I cant find the equivalent fill function.

try http://us3.php.net/manual/en/imagickdra ... lcolor.php

How do i create this xc:transparent with widthxheight?

see http://us3.php.net/manual/en/imagick.newimage.php