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Hi JRock,
as you've seen Amplify does not charge you for backend resources on top of the respective AWS service usage. In your case, you'll be charged as per Amazon Textract pricing. You can see here that Textract is integrated into Predictions.
Predictions comes with built-in support for Amazon Translate, Amazon Polly, Amazon Transcribe, Amazon Rekognition, Amazon Textract, and Amazon Comprehend.
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So just to confirm, if i am using amplify prediction to identify document with text (table will cost me 15/1k pages and form will cost me 50/1k pages)?: https://docs.amplify.aws/android/build-a-backend/more-features/predictions/identify-text/#detect-text-in-a-document
and if i use the one above with TextFormatType.PLAIN, i will be charged according to amazon rekognition? What if i use TextFormatType.ALL, how will i be charged?
So, Amplify will use Amazon Rekognition (default for plain text) as well as Amazon Textract (default for documents), see https://docs.amplify.aws/javascript/build-a-backend/more-features/predictions/identify-text/ If you select "ALL", it will try to detect forms as well as tables, see https://docs.amplify.aws/javascript/build-a-backend/more-features/predictions/identify-text/#identify-structured-tables
So, if i just want to extract text detected on the image i input, am i charged under Detect Document Text API OR Analyze Document API. For example, amazon textract has a detect text and analyze document api from https://aws.amazon.com/textract/pricing/, however, under amplify there is no such difference, it is all just combined into: "format of TextFormatType (i.e. FORM, TABLE or ALL)". How do i use the detect text api in amplify? https://docs.aws.amazon.com/textract/latest/dg/how-it-works-detecting.html