class.upload.php is a powerful and mature PHP class to manage uploaded files, and manipulate images in many ways. The script is available under a GPL license.
Yes, it is what I did, turn it into RGB mode before upsclaing it. In fact, I use The GIMP, which gives the same results as Photoshop.
It seems to me that GD might not be able to convert the color space from palette to RGB. I tried a few things, but always ended up with the same result. Alternatively, maybe the color space is converted to RGB, but the resize routine of GD are basic, and don't apply that "blur filter".
I also try with a bi-cubic resampling function, but downscaling looks bad, and upscaling looks the same (pixelated).Reply
It seems to me that GD might not be able to convert the color space from palette to RGB. I tried a few things, but always ended up with the same result. Alternatively, maybe the color space is converted to RGB, but the resize routine of GD are basic, and don't apply that "blur filter".
I also try with a bi-cubic resampling function, but downscaling looks bad, and upscaling looks the same (pixelated).