# Modify pic via canvas

**URL:** https://discourse.nodered.org/t/modify-pic-via-canvas/89501
**Category:** General
**Created:** [15 July 2024 06:55 UTC](https://discourse.nodered.org/t/modify-pic-via-canvas/89501 "2024-07-15T06:55:55Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![HenryTrang](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/henrytrang/32/81582_2.png) [@HenryTrang](https://discourse.nodered.org/u/HenryTrang)
#### Post date: [15 July 2024 06:55 UTC](https://discourse.nodered.org/t/modify-pic-via-canvas/89501/1 "2024-07-15T06:55:55Z")

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hello all

i have been trying for day to mark a circle on a pic. initially i get a base64 string, i draw a circle on canvas then i get the update pic. and i wonder how can a do it in node-red.  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/f/7f06bfade5608ffd08d76189211c377bc1bfed66.png)

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### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [13 October 2024 06:56 UTC](https://discourse.nodered.org/t/modify-pic-via-canvas/89501/2 "2024-10-13T06:56:15Z")

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