Direct thermal receipt printers (such as ESC/POS 58mm and 80mm cash register printers) and desktop thermal label printers cannot print grayscale tones. They operate strictly as binary devices: heating elements either burn a black dot onto heat-sensitive paper or leave it blank white. Printing continuous-tone photos or graphics requires error diffusion dithering to simulate shading through micro-stipple dot distributions.

### Error Diffusion Dithering Algorithms The studio converts images to pure 1-bit monochrome using algorithmic spatial quantization: - **Bill Atkinson Dithering:** Propagates 3/8 of quantization error to neighboring pixels while discarding 2/8. This creates sharp, clean mid-tone dot patterns with crisp contrast, making it the historical standard for classic Macintosh interfaces and thermal receipt printing. - **Floyd-Steinberg Dithering:** Distributes 100% of quantization error across 4 neighboring pixels (7/16 right, 3/16 down-left, 5/16 down, 1/16 down-right), providing smooth photographic shading across complex gradients. - **Fixed Luminance Threshold:** Simple binary cutoff at a configurable 0–255 threshold (default: 128) for high-contrast line art, QR codes, and text logos. - **Standard Receipt Width Scaling:** Pre-scales images to native thermal dot widths: 384 pixels (standard 58mm mobile/POS roll), 576 pixels (standard 80mm register roll), or 812 pixels (4×6 inch shipping label width at 203 DPI).

### Worked Dithering Workflow Suppose you want to print a graphic logo on an 80mm thermal receipt: 1. Upload your color PNG or JPEG image. 2. Select the **80mm (576px)** paper width preset to match your printer mechanism. 3. Choose the **Atkinson** algorithm for sharp, clean thermal rendering. 4. The canvas processes the image in real time, converting color pixels into binary black and white dot clusters. 5. Click **Download 1-Bit Image** to save a binary PNG ready for printing via ESC/POS thermal printer utilities.

### In-Browser Canvas Privacy All image scaling, pixel luminance quantization, and error diffusion calculations execute locally on your device using the HTML5 Canvas 2D API. Your business logos, receipt designs, and uploaded images are never uploaded to remote servers.