How can I improve the clarity of Flourish chart screenshots in my Puppeteer script?

Other Questions Puppeteer
1

I’m trying to get clear screenshots of Flourish Studio charts using Puppeteer, but I’m running into a weird issue. The main chart looks fuzzy, while everything else on the page is crystal clear.

Here’s a quick rundown of my setup:

const puppeteer = require('puppeteer');

async function captureChart() {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  
  await page.setViewport({ width: 1600, height: 900, deviceScaleFactor: 2 });
  await page.goto('https://flourish.studio/example-chart');
  
  await page.screenshot({ path: 'chart.png', fullPage: true });
  
  await browser.close();
}

captureChart();

I’ve tried playing with the deviceScaleFactor, but it doesn’t seem to help the chart quality. Is it because the chart is in an iframe? Do I need to tweak something inside the iframe before taking the screenshot?

Has anyone else run into this problem? Any tips on getting that chart to look as sharp as the rest of the page would be awesome!

2

I’ve faced a similar issue with Puppeteer and Flourish charts. The fuzziness can be related to when the screenshot is taken or the way the chart is rendered in its iframe. I found it helped to pause a bit longer before capturing the image so that the chart fully renders. Instead of grabbing the whole page, targeting the specific iframe proved effective, and adjusting the viewport size sometimes made a difference. It’s often about tweaking wait times and element specificity to get a clearer image.

3

hey mate, i had similar probs. try waiting longer before screenshot, like page.waitForTimeout(5000). also, target the iframe directly:

const frame = page.frames().find(f => f.url().includes(‘flourish’));
await frame.screenshot({ path: ‘chart.png’ });

this worked for me. good luck!

4

Having worked extensively with Puppeteer for capturing chart visualizations, I can share a technique that’s proven effective. Instead of taking a full-page screenshot, try isolating the chart’s iframe and capturing it directly. You’ll need to locate the iframe, wait for it to load completely, then execute the screenshot within its context. Here’s a snippet to illustrate:

await page.waitForSelector('iframe');
const frame = page.frames().find(f => f.url().includes('flourish'));
await frame.waitForSelector('.chart-container');
const element = await frame.$('.chart-container');
await element.screenshot({ path: 'chart.png' });

This approach often yields sharper results as it focuses solely on the chart element. Additionally, consider increasing the wait time before capture to ensure full rendering.