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Why do really long exposure photos weigh more MB? Shouldn’t every pixel have the same amount of information regardless of how many seconds it was exposed?

Sarah Jenkins
Sarah Jenkins
Lead Content Curator · Mar 7, 2026 · Updated Apr 13, 2026

The jpeg format we store photos in is designed to store a good photograph efficiently. A good photo has large areas of smooth, even gradients, and Jpeg does a great job of *compressing* these to take up less space. A long exposure photo will have more random 'roughness' in the picture.

79
Words

1 min
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#203
of 500 in Technology

+5%
vs Category Avg

The Short Answer

The jpeg format we store photos in is designed to store a good photograph efficiently. A good photo has large areas of smooth, even gradients, and Jpeg does a great job of *compressing* these to take up less space. A long exposure photo will have more random 'roughness' in the picture. It will be much more *noisy*, with small, random changes in individual pixels. Jpeg is not designed for this, so it takes more space to store the noise.

Analysis

Key Concepts: Jpeg, store, designed

This explanation focuses on jpeg, store, designed and spans 79 words across 5 sentences. The depth is typical for Technology questions (category average: 75 words), striking a balance between accessibility and completeness.

What This Answer Covers

The explanation opens with: “The jpeg format we store photos in is designed to store a good photograph efficiently.” It then elaboratesultimately building toward a complete picture across 5 connected points.

How This Compares in Technology

Ranked #203 of 500 Technology questions by answer depth (top 41%). This falls in the detailed tier — above average depth. The explanation goes beyond surface-level but keeps things accessible.

Frequently Asked Questions

Is there a simple explanation for why really long exposure photos weigh more mb? shouldn't every pixel have the same amount of information regardless of how many seconds it was exposed?

The jpeg format we store photos in is designed to store a good photograph efficiently. A good photo has large areas of smooth, even gradients, and Jpeg does a great job of *compressing* these to take up less space. A long exposure photo will have…

How detailed is this explanation compared to similar Technology questions?

This is an above-average answer at 79 words, ranked #203 of 500 Technology questions by depth. The key concepts covered are jpeg, store, designed.

What approach does this answer take to explain really long exposure photos weigh more mb? shouldn't every p?

The explanation uses direct explanation across 79 words. It is categorized under Technology and addresses the question through 1 analytical lens.