Question 1

How do I run speedtest-resize with all supported libraries?

Accepted Answer

Install it using 'go get -u github.com/fawick/speedtest-resize -tags all', then run 'go run main.go' in a folder with JPG files. Ensure external tools like ImageMagick and Vips are installed first, as the 'all' tag includes CGO bindings and external commands.

Question 2

Which Go image resizer is fastest for thumbnails?

Accepted Answer

Based on the benchmarks, external tools like 'vipsthumbnail' or ImageMagick with thumbnails are fastest, while pure Go libraries like 'rez' or 'nfnt/resize' are slower. For example, 'vipsthumbnail' averaged 0.120s per file, whereas pure Go options took over 2.9s in some tests.

Question 3

speedtest-resize or writing my own benchmarks: which is better?

Accepted Answer

speedtest-resize saves time by providing pre-configured tests for multiple libraries, but if you need specific scenarios (e.g., different image formats or quality metrics), custom benchmarks might be necessary. This tool is ideal for quick comparisons but lacks flexibility for tailored use cases.

Question 4

How should I interpret the average time results in the tables?

Accepted Answer

The average time per file includes loading, scaling to a thumbnail (150x100 pixels), and saving as JPG. Lower times indicate faster performance, but note that results vary by hardware and library version, so cross-reference multiple test scenarios from the README.

Question 5

Can I add new image resizing libraries to speedtest-resize?

Accepted Answer

Yes, but it requires modifying the Go source code to integrate new libraries, which involves adding benchmark logic and potentially handling build tags. The project is open-source, but no built-in extensibility mechanism is provided in the README.

Question 6

Does speedtest-resize compare image quality between libraries?

Accepted Answer

No, it focuses solely on speed and file size metrics, not on visual quality or algorithm differences. The README mentions using the fastest algorithms (e.g., 'Box' for gift) but does not evaluate output quality, which is a key consideration for many applications.

speedtest-resize

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