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Get JPEG data of an image (:jpeg_data)

Declaration​

jpeg_data = img:jpeg_data([ quality ])

Parameters​

  • quality
    Number, optional. Image quality, 0.0~1.0. Default 1.0

Returns​

  • jpeg_data
    String. JPEG data. Modifying this data will not affect the image object

Description​

Obtain the JPEG data of the image object
Performance: this function copies data twice

Example​

-- Save full-screen image with 80% quality (lossy compression)
file.writes('/var/mobile/1.jpg', screen.image():jpeg_data(0.8))

Note: This example uses functions outside this chapter screen.image, file.writes