Imagick question

[Ashley M. Kirchner]

    I'm trying to use Imagick:roundCorners() however the resulting image
has the background color on the corners set to black if I save the image
as a JPG format.  If I save it as a PNG format, the rounded corners are
transparent.  Does anyone know if the background color can be set to
white when saving as a JPG format?  I'd rather have 122K over 371K for a
file size ...

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[Brady Mitchell-2]

On Thu, Nov 5, 2009 at 12:48 AM, Ashley M. Kirchner <ashley@...> wrote:
>   I'm trying to use Imagick:roundCorners() however the resulting image has
> the background color on the corners set to black if I save the image as a
> JPG format.  If I save it as a PNG format, the rounded corners are
> transparent.  Does anyone know if the background color can be set to white
> when saving as a JPG format?  I'd rather have 122K over 371K for a file size

I'm sure it can be done, but without seeing your code we can't really help.

Brady

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[Ashley Sheridan-3]

On Thu, 2009-11-05 at 01:46 -0800, Brady Mitchell wrote:

> On Thu, Nov 5, 2009 at 12:48 AM, Ashley M. Kirchner <ashley@...> wrote:
> >   I'm trying to use Imagick:roundCorners() however the resulting image has
> > the background color on the corners set to black if I save the image as a
> > JPG format.  If I save it as a PNG format, the rounded corners are
> > transparent.  Does anyone know if the background color can be set to white
> > when saving as a JPG format?  I'd rather have 122K over 371K for a file size
>
> I'm sure it can be done, but without seeing your code we can't really help.
>
> Brady
>

It might be that you need to define white as a first colour first and
fill the canvas with it. I've had similar problems in GD which were
solved like this.

Thanks,
Ash
http://www.ashleysheridan.co.uk

[Ashley M. Kirchner]

Brady Mitchell wrote:
> I'm sure it can be done, but without seeing your code we can't really
> help.
    Easily solved.  From the PHP manual
(http://www.php.net/manual/en/function.imagick-roundcorners.php):

      <?php

        $image = new Imagick();
        $image->newPseudoImage(100, 100, "magick:rose");
        $image->setImageFormat("png");

        $image->roundCorners(5,3);
        $image->writeImage("rounded.png");
      ?>

    That produces a nice transparent cornered image, as it should.  
However, try saving it as a JEPG instead.  Set the image format to
'jpeg' and write it out as 'rounded.jpg' and you'll notice the corners
are now black.

    I know JPEG doesn't support transparency, that's fine.  What I want
is to change the black to white instead.

    -- A

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[Ashley Sheridan-3]

On Thu, 2009-11-05 at 12:22 -0700, Ashley M. Kirchner wrote:

> Brady Mitchell wrote:
> > I'm sure it can be done, but without seeing your code we can't really
> > help.
>     Easily solved.  From the PHP manual
> (http://www.php.net/manual/en/function.imagick-roundcorners.php):
>
>       <?php
>
>         $image = new Imagick();
>         $image->newPseudoImage(100, 100, "magick:rose");
>         $image->setImageFormat("png");
>
>         $image->roundCorners(5,3);
>         $image->writeImage("rounded.png");
>       ?>
>
>     That produces a nice transparent cornered image, as it should.  
> However, try saving it as a JEPG instead.  Set the image format to
> 'jpeg' and write it out as 'rounded.jpg' and you'll notice the corners
> are now black.
>
>     I know JPEG doesn't support transparency, that's fine.  What I want
> is to change the black to white instead.
>
>     -- A
>

Fill the background with white before you create the corners.

Thanks,
Ash
http://www.ashleysheridan.co.uk

[Ashley M. Kirchner]

Ashley Sheridan wrote:
> Fill the background with white before you create the corners.
    Well, I tried that, with no luck.  This is my actual code:

      $width = 150;
      $height = 150;
      $im = new Imagick('original/' . $filename);
      $im->thumbnailImage($width, $height, true);
      $im->sharpenImage(50, 1);
      $im->setImageBackgroundColor('white');
      $im->roundCorners(5, 5, 7);
      $im->setImageFormat('jpeg');
      $im->writeImage('thumbnail/' . $filename);
      $im->clear();
      $im->destroy();

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[Jason Young]

I think to do this effectively, you'll need to create two images, as
such (adapting from your code):

<?php
        $width = 150;
        $height = 150;
        $background = 'white';

        $im = new Imagick();
        $im->newImage($width, $height, $background);

        $thumb = new Imagick('original/' . $filename);
        $thumb->thumbnailImage($width, $height, true);
        $thumb->sharpenImage(50, 1);
        $thumb->roundCorners(5, 5, 7);

        $im->compositeImage($thumb, Imagick::COMPOSITE_OVER, 0, 0);
        $im->setImageFormat('jpeg');
        $im->flattenImages();

        $im->writeImage('thumbnail/' . $filename);
/* Or display directly to screen
header("Content-Type: image/jpeg");
echo $im;
*/
        $im->clear();
        $im->destroy();
        $cv->clear();
        $cv->destroy();
?>

That seems to be the only way I can find to control which colors are used.

-Jason

Ashley M. Kirchner wrote:

> Ashley Sheridan wrote:
>> Fill the background with white before you create the corners.
>    Well, I tried that, with no luck.  This is my actual code:
>
>      $width = 150;
>      $height = 150;
>      $im = new Imagick('original/' . $filename);
>      $im->thumbnailImage($width, $height, true);
>      $im->sharpenImage(50, 1);
>      $im->setImageBackgroundColor('white');
>      $im->roundCorners(5, 5, 7);
>      $im->setImageFormat('jpeg');
>      $im->writeImage('thumbnail/' . $filename);
>      $im->clear();
>      $im->destroy();
>

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