Convert GLCD Bitmaps Quickly: Easy GLCD Bitmap Converter Guide

Free GLCD Bitmap Converter Tools and Best Practices

Free tools (short list)

• LCD Assistant — simple Windows program that converts images to C arrays for many graphic LCDs.
• GIMP + export scripts — GIMP can be used with plugins or export-to-C-array scripts to produce bitmaps.
• Image2Pico — web-based converters that output byte arrays for small displays (verify compatibility).
• Online GLCD converters — several browser tools accept PNG/BMP and export horizontal/vertical byte orders; availability varies.
• Platform-specific utilities — Arduino libraries and IDE plugins sometimes include image converters (e.g., Adafruit utilities).

Best practices

1. Use monochrome source images — convert to pure black-and-white (dithered or thresholded) before exporting to avoid ambiguous pixels.
2. Match display orientation and byte order — set converter options for your GLCD’s page/column orientation and bit ordering (LSB/MSB) to avoid garbled graphics.
3. Size to the display — resize images to the exact GLCD resolution (width × height) before conversion to prevent clipping or scaling artefacts.
4. Choose appropriate dithering — for photos or gradients, try ordered or Floyd–Steinberg dithering to preserve perceived detail in monochrome.
5. Check padding and alignment — some displays require each row or page to be byte-aligned; enable padding options if available.
6. Test with reference patterns — convert simple test images (grid, checkerboard, single pixel) to verify mapping and byte order.
7. Optimize for memory — trim unused margins and use run-length encoding or compression if your microcontroller has limited flash.
8. Use clear naming and comments — when exporting C arrays, include width/height and byte-order comments for future reference.
9. Automate in build — integrate conversion in your build pipeline (scripts or Makefile) to keep assets in sync with source.
10. Verify license and security — for web tools, confirm they don’t store uploads if your images are sensitive.

Quick troubleshooting checklist

• Image appears rotated → swap width/height or change orientation setting.
• Image mirrored → toggle horizontal flip option.
• Garbled rows → wrong page/column mapping or bit order; test alternate byte-order settings.
• Missing rows/cols → check for required padding per row/page.