PHP - Pdo Abstraction Layer?

Hi everyone,
  I'm not sure if this would be the correct place to post this or if it's just a really dumb question, but I've been hearing about database abstraction layers a lot lately but I was just trying to get a better idea of what they are exactly. Is it a way of obscuring your db queries by calling functions or methods to help prevent security issues or something like that?

Thanks for any info!

-Frank

How does one go about using one class inside another?

For example, building a class that does some series of functions, and uses a db abstraction layer class in the process?

Here is the code I have right now:

<?php
header('Content-type: image/png');

$grey = new ImagickPixel('#ebebeb');
$orange = new ImagickPixel('#0f92d6');

$image = new Imagick('assets/lop.png');
$layer = new Imagick('assets/lop-base.png');
$layer->thumbnailImage(200, 0);
$image->thumbnailImage(200, 0);

$layer->paintOpaqueImage($grey, $orange, 100);

// Place layer on image
$image->compositeImage($layer, Imagick::COMPOSITE_SOFTLIGHT, 0, 0);

// Let's merge all layers (it is not mandatory).
$image->flattenImages();

echo $image;

?>

It's putting the layers on top of eachother very nice. The thing is is that this involves some heavy shading at times depending on the bunny breeds.   Here is what the base image ($image) looks like:     And here is what the overlay ($layer) looks like:     This is what the outcome looks like versus the intended result:       I've tried almost all of their composite constants.. I can't figure out how to do this or the best way of going about it. Because the colors are going to be dynamic throughout the site so I can't just save a .png of every color combination.. and there will be more colors layered on top of eachother like markings/patterns/etc.   Thanks for any help!

Hello,

I have a layered tiff file. I want to create a GD image from one of its layers. Looking for something like:

imagecreatefromtiff($img, 2);

Any idea of a library that would support this?

I want when onmouseover on particular section to put an OPACITY #fff 0.2 layer on everything except the selected class i.e. table Similarly as you have: .tableHighlight:hover{background-color:#eee}
<table id='table-main' class='tableHighlight'>
... but inversed (puts layer on everything else, but not the table itself)   --- http://jsfiddle.net/LYcm9/1/