In our application we want user upload-able images to be shown in
application.
The image is re-sized to 150x200 and Thumbnail are stored in DB.
Then we show images in browser using GWT RPC and retrieve base 64 encoded
image.
But to show image in IE8 the data can only be max 32K.
The question is can we make an image Transformation in GAE that reduce the
image size. e.g. reduce the number of colors, reduce the quality....?
I used ImagesServiceFactory.makeImFeelingLucky() BUT it does not help to
reduce the size.
Vlad
PS
the code snippet we used:
-- Upload ---
try {
Image image = ImagesServiceFactory.makeImage(imageData);
ImagesService imagesService =
ImagesServiceFactory.getImagesService();
// 3x4 proportions, we show 150x200 image
int width;
int height;
if (image.getWidth() * 4 / 3 < image.getHeight()) {
height = 200;
width = height * image.getWidth() / image.getHeight();
} else {
width = 150;
height = width * image.getHeight() / image.getWidth();
}
Transform touchup =
ImagesServiceFactory.makeImFeelingLucky();
Transform resize = ImagesServiceFactory.makeResize(width,
height);
CompositeTransform composite =
ImagesServiceFactory.makeCompositeTransform();
composite.concatenate(touchup);
composite.concatenate(resize);
composite.concatenate(touchup);
Image newImage = imagesService.applyTransform(composite,
image, OutputEncoding.PNG);
log.debug("new image size {}",
newImage.getImageData().length);
----
-- Send to GWT client ---
import com.google.appengine.repackaged.com.google.common.util.Base64;
return Base64.encode(imageData);
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