Layout is designed in portrait (176×264) then rotated 90° left to 264×176 for export. The graphic stays full color; your NFC/e-ink software can handle grayscale/4-color conversion.
The graphic is resized into the top frame in full color (no quantization).
The file name is based on the beer name (e.g. rocky-mountain-dunkel.png).
This canvas is exactly 264×176 pixels, showing your portrait design rotated 90° left.