CODEWITHSUNDEEP
javaimagegoogle-app-enginetext
Niv
Niv

Reputation: 53

Writing text to Image in Google App Engine (Java)

I'm writing code that runs on Google App Engine (Java). What I'm trying to do is augment an existing image by adding text. GAE does not have any text handling in its ImagesService. Does anyone have any idea?

I'd like my code to look something like this:

...
// Read image
byte[] pageData = readImage("images/page.png");
Image pageImage = ImagesServiceFactory.makeImage(pageData);

// Add text here
...

return pageImage;

Upvotes: 5

Views: 1579

Answers (2)

J Low
J Low

Reputation: 79

You can extend the colors on Google charts with alpha values, that way you can have a transparent png that you can overlay on top of another image using the Composite function.

http://chart.apis.google.com/chart?chs=300x50&cht=p3&chtt=hello&chts=000000FF,24&chf=bg,s,00000000

Upvotes: 0

Chris Farmiloe
Chris Farmiloe

Reputation: 14175

If you just need to overlay some simple text you could combine the Google Charts API with the Composite image function in the AppEngine Image API to get the desired result.

First construct a URL and use urlfetch from your app to grab the required text-image via the Charts API like:

enter image description here

URL: http://chart.apis.google.com/chart?chs=300x50&cht=p3&chtt=hello&chts=FFFFFF,24&chf=bg,s,000000 (Note the size, and colour params in this url)

Open your image with the Image API and use Composite with the image you wish to overlay text on.

Upvotes: 11

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