[Solved] You have a grayscale image with pixel values from 0 to 255. You want to display it using a colormap that highlights low values in blue... Which colormap should you choose and how do you apply it? | Matplotlib

Matplotlib - Image Display

You have a grayscale image with pixel values from 0 to 255. You want to display it using a colormap that highlights low values in blue and high values in red. Which colormap should you choose and how do you apply it?

AUse 'gray' colormap by passing cmap='gray' in plt.imshow()

BUse 'coolwarm' colormap by passing cmap='coolwarm' in plt.imshow()

CUse 'jet' colormap by passing cmap='jet' in plt.imshow()

DUse 'binary' colormap by passing cmap='binary' in plt.imshow()

Step-by-Step Solution

Solution:

Step 1: Identify colormap that maps low to blue and high to red
'coolwarm' smoothly transitions from blue (low) to red (high), perfect for this need.
Step 2: Apply colormap in plt.imshow()
Pass cmap='coolwarm' as a string parameter to plt.imshow() to apply it.
Final Answer:
Use 'coolwarm' colormap by passing cmap='coolwarm' in plt.imshow() -> Option B
Quick Check:
Blue to red colormap = coolwarm [OK]

Quick Trick: Use 'coolwarm' for blue-to-red gradients [OK]

Common Mistakes:

Choosing grayscale which lacks color cues
Using 'binary' which is black and white only
Assuming 'jet' is best for this purpose

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Which colormap should you choose and how do you apply it?

Step 1: Identify colormap that maps low to blue and high to red

Step 2: Apply colormap in plt.imshow()

Final Answer:

Quick Check:

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