You want to overlay a heatmap on a grayscale image so both are visible. Which method correctly achieves this in matplotlib?

hard📝 Application Q8 of 15

Matplotlib - Image Display

Display the grayscale image with <code>plt.imshow()</code> and overlay the heatmap with <code>plt.imshow()</code> using <code>alpha</code> less than 1

BPlot the heatmap first, then the grayscale image without transparency

CUse <code>plt.scatter()</code> to plot heatmap points over the image

DConvert the grayscale image to RGB before plotting the heatmap

Step-by-Step Solution

Solution:

Step 1: Plot base image
Use plt.imshow() to show the grayscale image.
Step 2: Overlay heatmap
Use plt.imshow() again for the heatmap with an alpha value (e.g., 0.5) to make it semi-transparent.
Step 3: Result
This allows both layers to be visible simultaneously.
Final Answer:
Display the grayscale image with plt.imshow() and overlay the heatmap with plt.imshow() using alpha less than 1 -> Option A
Quick Check:
Use alpha transparency to combine images [OK]

Quick Trick: Use alpha < 1 to overlay heatmap on image [OK]

Common Mistakes:

Plotting heatmap under image without transparency
Using scatter instead of imshow for heatmap

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More Matplotlib Quizzes

You want to overlay a heatmap on a grayscale image so both are visible. Which method correctly achieves this in matplotlib?

Step 1: Plot base image

Step 2: Overlay heatmap

Step 3: Result

Final Answer:

Quick Check:

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