Retrieve and update darktable operations params stored in sidecar xmp files. This helps automate image processing with darktable-cli

Tested on: MacOS and Linux

$ npm install @wmakeev/darkroom-xmp-tools

Take some darktable XMP

...
<darktable:history>
  <rdf:Seq>
    ...
    <rdf:li
    darktable:operation="exposure"
    darktable:enabled="1"
    darktable:modversion="5"
    darktable:params="0000000040a0093bd8ce374000004842000080c0"
    darktable:multi_name="1"
    darktable:multi_priority="0"
    darktable:blendop_version="7"
    darktable:blendop_params="gz12eJxjYGBgkGAAgRNODESDBnsIHll8ANNSGQM="/>
    ...
  <rdf:Seq>
</darktable:history>
...

add some code

const assert = require('assert')
const { decodeExposureParams, encodeExposureParams } = require('@wmakeev/darkroom-xmp-tools')

// from XMP darktable:params
const EXPOSURE_PARAMS_BIN_STR = '0000000040a0093bd8ce374000004842000080c0'

let paramsObj = decodeExposureParams(EXPOSURE_PARAMS_BIN_STR)

console.log('exposureParams:', JSON.stringify(paramsObj))
// "exposureParams": {
//   "mode": "EXPOSURE_MODE_MANUAL",
//   "black": 0.0021000057458877563,
//   "exposure": 2.871999740600586,
//   "deflickerPercentile": 50,
//   "deflickerTargetLevel": -4
// }

// before encode you can modify paramsObj ...

let encodedParamsStr = encodeExposureParams(paramsObj)

// ... and update exposure darktable:params in XMP file with new value

assert.strictEqual(encodedParamsStr, EXPOSURE_PARAMS_BIN_STR)

• decodeSharpenParams (encoded: string): SharpenParams

• encodeSharpenParams (params: SharpenParams): string

• decodeLevelsParams (encoded: string): LevelsParams

• encodeLevelsParams (params: LevelsParams): string

• decodeShadhiParams (encoded: string): ShadhiParams

• encodeShadhiParams (params: ShadhiParams): string

• decodeExposureParams (encoded: string): ExposureParams

• encodeExposureParams (params: ExposureParams): string

• decodeBlendParams (encoded: string): BlendParams

• encodeBlendParams (params: BlendParams): string

• decodeClippingParams (encoded: string): ClippingParams

• encodeClippingParams (params: ClippingParams): string

• decodeDefringeParams (encoded: string): DefringeParams

• encodeDefringeParams (params: DefringeParams): string

• decodeFlipParams (encoded: string): FlipParams

• encodeFlipParams (params: FlipParams): string

• decodeBasecurveParams (encoded: string): Basecurve

• encodeBasecurveParams (params: Basecurve): string

• decodeParams (operation: 'sharpen', encodedParams: string): SharpenParams

• decodeParams (operation: 'levels', encodedParams: string): LevelsParams

• decodeParams (operation: 'shadhi', encodedParams: string): ShadhiParams

• decodeParams (operation: 'exposure', encodedParams: string): ExposureParams

• decodeParams (operation: 'blend', encodedParams: string): BlendParams

• decodeParams (operation: 'clipping', encodedParams: string): ClippingParams

• decodeParams (operation: 'defringe', encodedParams: string): DefringeParams

• decodeParams (operation: 'flip', encodedParams: string): FlipParams

• decodeParams (operation: 'basecurve', encodedParams: string): BasecurveParams

• encodeParams (operation: string, params: Params): string

• decodeMaskPoints<MaskPoint> (maskType: string, numberPoints: number, encodedPoints: string): Array<MaskPoint>

• encodeMaskPoints<MaskPoint> (maskType: string, points: Array<MaskPoint>): string

• decodeCircleMask (encodedMask: string): MaskCirclePoint

• encodeCircleMask (mask: MaskCirclePoint): string

• decodeEllipseMask (encodedMask: string): MaskEllipsePoint

• encodeEllipseMask (mask: MaskEllipsePoint): string

• decodeGradientMask (encodedMask: string): MaskGradientPoint

• encodeGradientMask (mask: MaskGradientPoint): string

• GLib (How to install GLib 2.0 on Ubuntu 17.04)

• Windows support?
• Improve errors messages and arguments validation

• Fix Typescript typings
• Add Travis build

• Add Linux support
• Add some arguments validation
• Fix some bugs