Why do the pictures lose their quality when adding to the ImageList?

I'm trying to create an ImageList for my TrayIcon but the images are not showing as high quality. They are originally very clear but as soon as I put them on the ImageList at Desi开发者_开发百科gn-Time they are deformed. I tried 16x16 in ICO and PNG formats.

Also, which format is preferred in ImageLists?

Please advise.

First of all, ensure that you have the correct size of the images you're inserting against your image list's width and height. I can't give you an advice about the image formats, but I would say it doesn't matter - if you'll use ICO or PNG the result should be the same. Since some newer version of Delphi (I'm using D2009) there's a property ColorDepth, which is set to cdDeviceDependent by default. You can try to change this property, but I hope the default setting choose the right color depth for the inserted images.