Image Converter: The Tool That Taught Me to Never Underestimate "Simple" Tasks
PNG to JPG — how hard could it be? Much harder than I thought, once you add color profiles, transparency, and EXIF data to the mix.
There's a running joke among developers: every "simple" task hides an iceberg of complexity. Image conversion is the perfect example.
The basic case is easy. Load image, change format, save. Done in five lines of code. But then the edge cases start appearing.
What happens when you convert a PNG with transparency to JPG? JPG doesn't support transparency — so what color should those pixels become? White? Black? The user's chosen background color? I had to implement a background fill option.
What about color profiles? A photo from an iPhone has a different color profile than one from a DSLR camera. Converting between formats without respecting the color profile can make your reds look slightly orange or your blues look purple. Subtle, but real.
EXIF data — the metadata embedded in photos (GPS location, camera settings, date taken) — needed to be preserved or stripped depending on what the user wanted. Some people converting images for a portfolio want their creative settings preserved. Someone converting for a quick WhatsApp send wants a tiny file and doesn't care about metadata.
I ended up building a full options panel. Quality slider. Background color picker. EXIF preserve/strip toggle. Resize option. What started as "five lines of code" became one of the most feature-complete tools on the platform.