Extract Data from a Hand-Drawn Chart

This use case demonstrates how to extract data from a hand-drawn chart. You will upload a chart image into Revdoku, run an AI checklist to read every data point, then use a built-in script to deduplicate and list the extracted values.

Step 1: Open the Envelopes inbox.

Open the Envelopes inbox. The inbox lists the documents available for review.

Step 2: Upload the chart.

Upload the chart. Click Open File and pick dog-weight.png; Revdoku encrypts and uploads the image.

Step 3: Open the chart.

Open the chart. The viewer shows a hand-drawn Dog’s Weight line chart with monthly points from January to August.

Step 4: Pick the chart-reading checklist.

Pick the chart-reading checklist. Choose Graphs with date and value — a one-rule checklist that asks the AI to extract every Date, Value pair.

Step 5: Run the review.

Run the review. Click Review and Revdoku analyzes the page with Google Gemini and runs the rule.

Step 6: Read the extracted points.

Read the extracted points. Every monthly point is annotated on the right with its parsed value, for example val:Aug,78.

Step 7: Open the envelope menu.

Open the envelope menu. Pick Edit Envelope Scripts to add a script that rolls up the extracted values.

Step 8: Insert a sample script.

Insert a sample script. From the Sample Scripts dropdown, pick Unique values list to deduplicate and alphabetize the points.

Step 9: Read the rolled-up values.

Read the rolled-up values. A yellow summary card lists the 6 unique points (Aug,78 · Feb,58 · Jan,54 · Jul,70 · Jun,60 · Mar,65) above the original chart.

Conclusion

In this tutorial it was demonstrated how to use Revdoku for extracting data from a hand-drawn chart. The following steps were shown:

• Open the Envelopes inbox
• Upload the chart
• Open the chart
• Pick the chart-reading checklist
• Run the review
• Read the extracted points
• Open the envelope menu
• Insert a sample script
• Read the rolled-up values

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What You Learned

This case showed how Revdoku can take a document, apply a structured checklist, and surface specific findings — all in under a minute. No manual line-by-line reading required.

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Disclosure: Sample documents in this use case were generated using AI and contain intentional errors for demonstration purposes. All names, companies, and details are fictional.