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CaiJingLong / dart_image_size_getter

Use dart file api to get image size, needn't use decode. just read the metadata.
Apache License 2.0
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Jpg orientation is not taken into account #25

Closed Nihildum closed 1 year ago

Nihildum commented 2 years ago

Hello and thank you for the nice plugin.

I tried to read some jpg files and the reported width and height was wrong in files that have the 'Right-Top' orientation.

I decoded the image headers via ImageMagick. Do you need any additional information?

Correct read:

Image:
  Filename: IMG_1697.JPG
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 4000x3000+0+0
  Resolution: 180x180
  Print size: 22.2222x16.6667
  Units: PixelsPerInch
  Colorspace: sRGB
  Type: TrueColor
  Base type: Undefined
  Endianness: Undefined
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33)
    green primary: (0.3,0.6)
    blue primary: (0.15,0.06)
    white point: (0.3127,0.329)
  Background color: white
  Border color: srgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 4000x3000+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 90
  Orientation: TopLeft

Read wrongly:

Image:
  Filename: IMG_1690.JPG
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 4000x3000+0+0
  Resolution: 180x180
  Print size: 22.2222x16.6667
  Units: PixelsPerInch
  Colorspace: sRGB
  Type: TrueColor
  Base type: Undefined
  Endianness: Undefined
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33)
    green primary: (0.3,0.6)
    blue primary: (0.15,0.06)
    white point: (0.3127,0.329)
  Background color: white
  Border color: srgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 4000x3000+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 90
  Orientation: RightTop
Nihildum commented 1 year ago

Never mind, I missed the needRotate field in the Size structure.