Dockerfile

FROM python:3

WORKDIR /usr/src/app

COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD [ "python", "./tint.py" ]

spec.json

{
    "image": "camodules.azurecr.io/tint",
    "spec": {
        "inputs": {
            "input_image": {
                "type:file": {}
            },
            "red": {
                "type:number": {
                    "lower_inclusive": 0.0,
                    "upper_inclusive": 1.0
                }
            },
            "green": {
                "type:number": {
                    "lower_inclusive": 0.0,
                    "upper_inclusive": 1.0
                }
            },
            "blue": {
                "type:number": {
                    "lower_inclusive": 0.0,
                    "upper_inclusive": 1.0
                }
            }
        },
        "outputs": {
            "tinted_image": {
                "type:file": {}
            }
        }
    },
    "ui": {
        "inputs": {
            "red": {
                "index": 51,
                "label": "Red channel",
                "widget:slider": {
                    "step": 0.1
                }
            },
            "green": {
                "index": 52,
                "label": "Green channel",
                "widget:slider": {
                    "step": 0.1
                }
            },
            "blue": {
                "index": 53,
                "label": "Blue channel",
                "widget:slider": {
                    "step": 0.1
                }
            }
        },
        "outputs": {}
    }
}

tint.py

import json
import os

input_json = json.loads(os.environ['WFE_INPUT_JSON'])
#// end of loading input params

import matplotlib.pyplot as plt
from skimage import color, data, img_as_float, io

original_image = io.imread(input_json['input_image'])

grayscale_image = img_as_float(original_image[::2, ::2])
image = color.gray2rgb(grayscale_image)

multiplier = [float(input_json['red']), float(input_json['green']), float(input_json['blue'])]

io.imsave("/output/tinted.jpg", multiplier * image)

#// begin of params output definition
output_json = {
    "tinted_image": "/output/tinted.jpg"
}

with open("/output/" + input_json['WFE_output_params_file'], 'w') as f:
    json.dump(output_json, f)