cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
Guero
Helper I
Helper I

Merging a Photo Image and a Pen Input Image using Flow and API

Hi,

 

The app I'm currently building in PowerApps utilizes a camera and pen input function, where in essentially you take a picture and you're then given the option to draw on said picture using the Pen Input function so as to add notes, annotations, etc. At the moment I have it so that when the picture is taken and the notes are added, both are added to Azure Storage as two separate images, and what I'm trying to do is merge them using a Flow, which receives all the information about the images, and then uses HTTP call to a free API called 'Convert API' to join them together.

 

Below is my Flow as it currently is:

 

One.png

 

Two.png

 

Three.png

 

Four.png

 

Five.png

 

Six.png

 

 

 

For the most part it runs smoothly, however when it reaches the HTTP step, it fails with the below error:

 

"{"Code":4002,"Message":"Bad JSon format. The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. "}"

 

Seven.png

 

I'm thinking that the error is possibly coming from the HTML input that gets passed along, specifically the "data:image/png;base64," header, but I'm not 100% sure, and if it is that how would I go about removing it?

 

Eight.png

 

 

Any help would be appreciated - Thank you!

 

 

 

 

12 REPLIES 12
Krishna92
Employee
Employee

@Guero 

 

I think the issue here is with the additional source path that is being added.

 

Regarding the source path that you are getting in the content output, that is coming from the azure output where the data is being stored once you convert the data into base64() format you will get that source path added.

 

You can use the formula Mid(base64() value of the image, 24,Len(base64() value of the image) - 24)

Use this formula to get rid of the extra path information.

 

If this information helps you, please hit the like button and mark the solution as resolved, so that it will help other users in future.

 

@Krishna92 

Thanks for the response - I'll give it a shot! Whereabouts in the Flow would I put the Mid formula? Would it be in it's own action entirely? Sorry if this is a stupid question, I'm not particularly adept at Flow or Powerapps!

 

@Guero 

 

You can put it in the place where you are converting the Azure Blob storage value to a Json data.

This will extract the path from that Json data.

The best idea in this scenario will be to declare a variable in flow of type string/json.

Store the Image Json data in the variable.

Then apply the mid() formula on output of that variable.

Mid(Output of variable, 24,Len(Output of variable) - 24)

 

 

@Krishna92 

Thankyou for your assistance so far - as advised I've now stored the data in a variable and used the mid() formula on it, which when looking at my output now appears to have removed the extra path information, however the Flow is still failing and I'm still getting the same message as before:

"{"Code":4002,"Message":"Bad JSon format. The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or an illegal character among the padding characters. "}" 

 

There must be a junk character in there somewhere, but I'm having no luck finding it:

 

436343736.png

 

The only other thing that's occurred to me that could possibly be incorrect is the ImageHTML variable I've got in the Flow, and whether the DataURI Expressions I'm using are causing an issue:

 

7343734633.png

 

 If you have any input I'd be most appreciative.

 

 

 

@Krishna92 

Further to my last post, I've tested sending the Photo and Drawing variables separately to the API and both have been successful, so as I see it there's no issue with the base64 of the images themselves.



HTTP.png

 

HTTP2.png

 


In which case, I think the issue comes down to my writeup of the ImageHTML variable, which includes both the Photo and Drawing variables (base64 makeup of both images) and the sizing information.

 

ImageHTML.png

 

HTTP3.png

 HTTP4.png

 

 

Can anyone helps me how to make pen drawing on captured camera photo. I have been looking into this for the last few days.

SL93
Frequent Visitor

I know my answer is about 3 years late, but anyways: You were using double quotes in your HTML, which would not work in a JSON, since it is recognised as end of string. If you want to do anything like this in future use single quotes in HTML, so they don't interfere with the JSON.

MLe92
Helper I
Helper I

Hi together,

 

here is my Solution with SVG to Merge Images without Flow/Third parts or Code-Components.

— It's a Component with Pen Input and Background

 

GitHub - mlnc21/PowerApps-SVG-Merge-Modul: Merge Images in PowerApps without Flow or Code Components

 

If this post helps you give a 👍 and if it solved your issue consider Accept it as the solution to help the other members find it more.

Hi there,

I tried your component, it seems to only contain the edit bit though - missing the "Change Background" and "Merge Output Image" parts your Github screenshots show - am I doing something wrong?

Hi @ShannonC , 

I will Update the Readme.

You can usw the zip File to import as Canvas App. Then you can Show my properties.

inesrfo
Frequent Visitor

did you find the problem? I have the same one and I can't fix it

MLe92
Helper I
Helper I

Helpful resources

Announcements

Announcing Power Apps Copilot Cookbook Gallery

We are excited to share that the all-new Copilot Cookbook Gallery for Power Apps is now available in the Power Apps Community, full of tips and tricks on how to best use Microsoft Copilot as you develop and create in Power Apps. The new Copilot Cookbook is your go-to resource when you need inspiration--or when you're stuck--and aren't sure how to best partner with Copilot while creating apps.   Whether you're looking for the best prompts or just want to know about responsible AI use, visit Copilot Cookbook for regular updates you can rely on--while also serving up some of your greatest tips and tricks for the Community. Our team will be reviewing posts using the new "Copilot" label to ensure we highlight and amplify the most relevant and recent content, so you're assured of high-quality content every time you visit. If you share a post that gets featured in the curated gallery, you'll get a PM in the Community to let you know!The curated gallery is ready for you to experience now, so visit the new Copilot Cookbook for Power Apps today: Copilot Cookbook - Power Platform Community. We can't wait to see what you "cook" up!    

Tuesday Tips: Getting Started in the Community

TUESDAY TIPS is back!   This weekly series of posts is our way of sharing helpful things we've learned or shared that have helped members of the Community. Whether you're just getting started or you're a seasoned pro, Tuesday Tips will help you know where to go, what to look for, and navigate your way through the ever-growing--and ever-changing--world of the Power Platform Community! The original run of Tuesday Tips was a highlight of last year, and these all-new Tips will hopefully prove to be just as informative as helpful. We will cover some basics about the Community, a few "insider tips" to make your experience even better, and sharing best practices gleaned from our most active community members and Super Users. Make sure to watch the News & Announcements each week for the latest and greatest Tuesday Tips!   THIS WEEK: I'm Brand New! What Do I Do? The number of new community members we have each week is pretty amazing, and we are so glad to welcome all of you to the Community! You may be wondering. "What do I do? Where do I get started? Will anyone be willing to help me? What I have a question? Help!"   Let's start with this: Welcome to the low-code revolution, and more importantly, welcome to the Power Platform Community! This is a great place to start. Whether you're busy with Power Apps, getting familiar with Power Automate, engaging Copilot Studio, or building in Power Pages, there are a few key places you should check out as you begin your journey: FORUMS: The forums are THE place to ask questions, look at questions asked by other Community members—and see answers and solutions from our Super Users and other helpful people in the Community. Power Apps ForumsPower Automate ForumsCopilot Studio ForumsPower Pages Forums   NEWS & ANNOUNCEMENTS: Our News & Announcements section highlights the newest and greatest updates in the Community, news from the product team, and so much more. It’s updated a few times each week and will also help you find ways to connect with what’s going on in the ever-growing world of Power Platform. Power Apps News & AnnouncementsPower Automate News & AnnouncementsCopilot Studio News & AnnouncementsPower Pages News & Announcements   GALLERIES: The Galleries section of the Community features tons of tips and tricks, features and benefits, and more—through videos created by our Super Users, product teams, and other helpful members of the Community. Power Apps GalleriesPower Automate Galleries Copilot Studio GalleriesPower Pages Galleries BLOGS: The community blogs section is full of handy step-by-step tips from members of the Community—and some of them include detailed answers to some of the questions most frequently asked questions, as well as how they solved a problem they faced. Power Apps Community BlogPower Automate Community BlogCopilot Studio Community BlogPower Pages Community Blog POWER UP PROGRAM: If you’d like to really take a huge step forward in your journey, we recommend checking out the Power Up Program, a Microsoft-sponsored initiative that trains new Power Platform users and has been a huge success since it launched a little over a year ago. There’s a waiting list, so definitely apply soon if you’re interested! Find out more here: Microsoft Power Up Program for career switchers.   There's so much more you'll discover in your Power Platform experience, and this Community is here for YOU! We are glad you've discovered us and can't wait to see where you grow! If you're new to the Community and just getting started, make sure to give this post a kudo and introduce yourself so we can welcome you!

Super User of the Month | Drew Poggemann

As part of a new monthly feature in the Community, we are excited to share that Drew Poggemann is our featured Super User for the month of February 2024. If you've been in the Community for a while, we're sure Drew's name is familiar to you, as he is one of our most active contributors--he's been a Super User for five consecutive seasons!   Since authoring his first reply 5 years ago to his 514th solution authored, Drew has helped countless Community members with his insights and expertise. In addition to being a Super User, Drew is also a User Group leader and a Microsoft MVP. His contributions to our Super User sessions and to the new SUIT program are always welcome--as well as his sense of humor and fun-loving way of sharing what he knows with others.   When Drew is not solving problems and authoring solutions, he's busy overseeing the Solution Architecture team at HBS, specializing in application architecture and business solution strategy--something he's been doing for over 30 years. We are grateful for Drew and the amazing way he has used his talent and skills to help so many others in the Community. If you are part of the SUIT program, you got to hear some great tips from Drew at the first SUIT session--and we know he still has much more to share!You can find him in the Community and on LinkedIn. Thank you for all you do, Drew!

Celebrating a New Season of Super Users with Charles Lamanna, CVP Microsoft Business Applications

February 8 was the kickoff to the 2024 Season One Super User program for Power Platform Communities, and we are thrilled to welcome back so many returning Super Users--as well as so many brand new Super Users who started their journey last fall. Our Community Super Users are the true heroes, answering questions, providing solutions, filtering spam, and so much more. The impact they make on the Communities each day is significant, and we wanted to do something special to welcome them at our first kickoff meeting of the year.   Charles Lamanna, Microsoft CVP of Business Applications, has stressed frequently how valuable our Community is to the growth and potential of Power Platform, and we are honored to share this message from him to our 2024 Season One Super Users--as well as anyone who might be interested in joining this elite group of Community members.     If you want to know more about Super Users, check out these posts for more information today:    Power Apps: What is A Super User? - Power Platform CommunityPower Automate: What is A Super User? - Power Platform Community Copilot Studio: What is A Super User? - Power Platform Community Power Pages: What is A Super User? - Power Platform Community

Super Users 2024 Season One is Here!

   We are excited to announce the first season of our 2024 Super Users is here! Our kickoff to the new year welcomes many returning Super Users and several new faces, and it's always exciting to see the impact these incredible individuals will have on the Community in 2024! We are so grateful for the daily difference they make in the Community already and know they will keep staying engaged and excited for all that will happen this year.   How to Spot a Super User in the Community:Have you ever written a post or asked for help in the Community and had it answered by a user with the Super User icon next to their name? It means you have found the actual, real-life superheroes of the Power Platform Community! Super Users are our heroes because of the way they consistently make a difference in the Community. Our amazing Super Users help keep the Community a safe place by flagging spam and letting the Community Managers know about issues. They also make the Community a great place to find answers, because they are often the first to offer solutions and get clarity on questions. Finally, Super Users share valuable insights on ways to keep the Community growing, engaging, and looking ahead!We are honored to reveal the new badges for this season of Super Users! Congratulations to all the new and returning Super Users!     To better answer the question "What is a Super User?" please check out this article: Power Apps: What is A Super User? - Power Platform CommunityPower Automate: What is A Super User? - Power Platform Community Copilot Studio: What is A Super User? - Power Platform Community Power Pages: What is A Super User? - Power Platform Community

Microsoft Power Platform | 2024 Release Wave 1 Plan

Check out the latest Microsoft Power Platform release plans for 2024!   We have a whole host of exciting new features to help you be more productive, enhance delegation, run automated testing, build responsive pages, and so much more.    Click the links below to see not only our forthcoming releases, but to also try out some of the new features that have recently been released to market across:     Power Apps  Power Automate  Copilot Studio   We can’t wait to share with you all the upcoming releases that will help take your Power Platform experience to the next level!    Check out the entire Release Wave: Power Platform Complete Release Planner 

Users online (3,746)