save image at higher resolution without pixelating it

[lostInTransit]

Hi

I am using the image picker controller to get an image from the user. After some operations on the image, I want the user to be able to save the image at 1600x1200 px, 1024x1024 px or 640x480 px (something like iFlashReady app).

The last option is the size of image I get in the UIImagePickerControllerDelegate method (when using image from camera roll)

Is there any way we can save the image at these resolutions without pixelating the images?

I tried creating a bitmap context with the width and height I want (CGBitmapContextCreate) and drawing the image there. But the image gets pixelated at 1600x1200.

Thanks

[smasher]

There is no way to increase the size of a bitmap image without decreasing the quality. With the resize you're doing, each pixel has to stretch to cover six new pixels; that will never look good. The detail just isn't there.

Maybe someone else knows how to get a larger picture from the camera roll.

[lostInTransit]

We get 1600x1200 images if we use the original image (from editingInfo) from the camera and 640x480 images from the photo library

The problem is I use this image for a UIImageView and place some more graphics on it. Now I want to save back the entire image (as displayed on the current view) I can capture the image and the dimensions are 320x480. But I want to save it at a higher resolution than that.