Color tagging
The color tagging service, when given an image, can compute a histogram of pixel colors and sort them by dominant colors into buckets. The colors in the image pixels are bucketed into 40 predominant colors which are representative of the color spectrum. A histogram of color values is then computed among those 40 colors. The service has two variants:
Color tagging (full image)
This method extracts a color histogram across the entire image.
Color tagging (with mask)
This method uses a deep-learning based foreground extractor to identify objects in the foreground. Once the foreground objects are extracted, a histogram is computed over the dominant colors for both the foreground and background regions, along with the entire image.
Tone extraction
In addition to the variants mentioned above, you can configure the service to retrieve a histogram of tones for:
- The overall image (when using full image variant)
- The overall image, and foreground and background regions (when using the variant with masking)
The following image was used in the example shown in this document:
API format
POST /services/v2/predict
Request - full image variant
The following example request uses the full-image method for color tagging and extracts colors from an image based on the input parameters provided in the payload. See the table below the example payload for more information on the input parameters shown.
curl -w'\n' -i -X POST https://sensei.adobe.io/services/v2/predict \
-H 'Prefer: respond-async, wait=59' \
-H "x-api-key: $API_KEY" \
-H "content-type: multipart/form-data" \
-H "authorization: Bearer $API_TOKEN" \
-F 'contentAnalyzerRequests={
"sensei:name": "Feature:autocrop:Service-af865523d46547e2b17fdf9b38e32a72",
"sensei:invocation_mode": "synchronous",
"sensei:invocation_batch": false,
"sensei:engines": [
{
"sensei:execution_info": {
"sensei:engine": "Feature:autocrop:Service-af865523d46547e2b17fdf9b38e32a72"
},
"sensei:inputs": {
"documents": [{
"sensei:multipart_field_name": "infile_1",
"dc:format": "image/jpg"
}]
},
"sensei:params": {
"top_n": 5,
"min_coverage": 0.005
},
"sensei:outputs":{
"result" : {
"sensei:multipart_field_name" : "result",
"dc:format": "application/json"
}
}
}
]
}' \
-F 'infile_1=@1431RDMJANELLERAWJACKE_2.jpg'
Response - full image variant
A successful response returns the details of the extracted colors. Each color is represented by a feature_value key, which contains the following information:
- A color name
- The percentage this color appears in relation to the image
- The RGB value of the color
"White":{"coverage":0.5834,"rgb":{"red":254,"green":254,"blue":243}}means the color found is white, which is found in 58.34% of the image, and has an average RGB value of 254, 254, 243.
{
"statuses": [{
"sensei:engine": "Feature:autocrop:Service-af865523d46547e2b17fdf9b38e32a72",
"invocations": [{
"sensei:outputs": {
"result": {
"sensei:multipart_field_name": "result",
"dc:format": "application/json"
}
},
"message": null,
"status": "200"
}]
}],
"request_id": "bfpzaJxKDxtgxpjUj5QDrN1jasjUw2RM"
}
[{
"overall": {
"colors": {
"White": {
"coverage": 0.5834,
"rgb": {
"red": 254,
"green": 254,
"blue": 243
}
},
"Orange": {
"coverage": 0.254,
"rgb": {
"red": 249,
"green": 165,
"blue": 45
}
},
"Gold": {
"coverage": 0.0817,
"rgb": {
"red": 253,
"green": 188,
"blue": 58
}
},
"Mustard": {
"coverage": 0.0727,
"rgb": {
"red": 253,
"green": 207,
"blue": 84
}
},
"Cream": {
"coverage": 0.0082,
"rgb": {
"red": 253,
"green": 236,
"blue": 174
}
}
}
}
}]
Notice that the result here has color extracted on the “overall” image region.
Request - masked image variant
The following example request uses the masking method for color tagging. This is enabled by setting the enable_mask parameter to true in the request.
curl -w'\n' -i -X POST https://sensei.adobe.io/services/v2/predict \
-H 'Prefer: respond-async, wait=59' \
-H "x-api-key: $API_KEY" \
-H "content-type: multipart/form-data" \
-H "authorization: Bearer $API_TOKEN" \
-F 'contentAnalyzerRequests={
"sensei:name": "Feature:autocrop:Service-af865523d46547e2b17fdf9b38e32a72",
"sensei:invocation_mode": "synchronous",
"sensei:invocation_batch": false,
"sensei:engines": [
{
"sensei:execution_info": {
"sensei:engine": "Feature:autocrop:Service-af865523d46547e2b17fdf9b38e32a72"
},
"sensei:inputs": {
"documents": [{
"sensei:multipart_field_name": "infile_1",
"dc:format": "image/jpg"
}]
},
"sensei:params": {
"top_n": 5,
"min_coverage": 0.005,
"enable_mask": true,
"retrieve_tone": true
},
"sensei:outputs":{
"result" : {
"sensei:multipart_field_name" : "result",
"dc:format": "application/json"
}
}
}
]
}' \
-F 'infile_1=@1431RDMJANELLERAWJACKE_2.jpg'
retrieve_tone parameter is also set to true in the above request. This enables us to retrieve a tone distribution histogram over warm, neutral, and cool tones in the overall, foreground and background regions of the image.Response - masked image variant
{
"statuses": [{
"sensei:engine": "Feature:autocrop:Service-af865523d46547e2b17fdf9b38e32a72",
"invocations": [{
"sensei:outputs": {
"result": {
"sensei:multipart_field_name": "result",
"dc:format": "application/json"
}
},
"message": null,
"status": "200"
}]
}],
"request_id": "gpeCyJsrJvOWd94WwZOyPBPrKi2BQyla"
}
[{
"overall": {
"colors": {
"White": {
"coverage": 0.5834,
"rgb": {
"red": 254,
"green": 254,
"blue": 243
}
},
"Orange": {
"coverage": 0.254,
"rgb": {
"red": 249,
"green": 165,
"blue": 45
}
},
"Gold": {
"coverage": 0.0817,
"rgb": {
"red": 253,
"green": 188,
"blue": 58
}
},
"Mustard": {
"coverage": 0.0727,
"rgb": {
"red": 253,
"green": 207,
"blue": 84
}
},
"Cream": {
"coverage": 0.0082,
"rgb": {
"red": 253,
"green": 236,
"blue": 174
}
}
},
"tones": {
"warm": 0.4084,
"neutral": 0.5916,
"cool": 0
}
},
"foreground": {
"colors": {
"Orange": {
"coverage": 0.6022,
"rgb": {
"red": 249,
"green": 165,
"blue": 45
}
},
"Gold": {
"coverage": 0.1935,
"rgb": {
"red": 253,
"green": 188,
"blue": 58
}
},
"Mustard": {
"coverage": 0.1722,
"rgb": {
"red": 253,
"green": 207,
"blue": 84
}
},
"Cream": {
"coverage": 0.0173,
"rgb": {
"red": 253,
"green": 235,
"blue": 170
}
},
"Yellow": {
"coverage": 0.0148,
"rgb": {
"red": 254,
"green": 229,
"blue": 117
}
}
},
"tones": {
"warm": 0.9827,
"neutral": 0.0173,
"cool": 0
}
},
"background": {
"colors": {
"White": {
"coverage": 0.9923,
"rgb": {
"red": 254,
"green": 254,
"blue": 243
}
},
"Dark_Brown": {
"coverage": 0.0077,
"rgb": {
"red": 83,
"green": 68,
"blue": 57
}
}
},
"tones": {
"warm": 0,
"neutral": 1.0,
"cool": 0
}
}
}]
In addition to the colors from the overall image, you can also see colors from the foreground and background regions now. Since tone retrieval is enabled for each of the above regions, you can also retrieve a tone’s histogram.
Input parameters
documentstop_nmin_coverageresize_imageFalse.enable_maskretrieve_toneDocument object
repo:pathsensei:repoTypesensei:multipart_field_namedc:format“image/jpeg”,
“image/png”,
“image/tiff”