https://sarojmaharjan.com/tags/rubyvips/ Recent content in Rubyvips on Saroj Maharjan Hugo en-US &copy; All rights reserved. Tue, 06 Oct 2026 00:00:00 +0000 https://sarojmaharjan.com/blog/create-and-solve-captcha-with-rubyvips/ Tue, 06 Oct 2026 00:00:00 +0000 https://sarojmaharjan.com/blog/create-and-solve-captcha-with-rubyvips/ <p>One of my Rails apps logs into a third-party portal on a schedule. That portal puts a captcha in front of every login: a 290x80 PNG, six glyphs, drawn over a fixed background texture.</p> <p>A human types it. A cron job cannot. So the controller has two paths: <code>create</code> takes whatever a person typed, and <code>auto_create</code> hands the image to an offline solver. Both open the session the same way; only the second one is allowed to fail with a &ldquo;needs a human&rdquo; error and fall back to the screen.</p>