Upload Dithered Image Data

Uploads pre-processed, dithered raw image data for fast, direct-to-screen rendering. This is an advanced feature.

The data is stored in a dedicated directory (not in galleries). The device parses and refreshes the screen immediately upon upload. If uploaded during slideshow mode, the next slideshow cycle is postponed by 5 minutes (300s).

Resolution must match the screen's current physical resolution exactly, or the device will error.

• e.g. EL073TF1 portrait (rotation 1 or 3): 480 x 800
• e.g. EL073TF1 landscape (rotation 0 or 2): 800 x 480

Color palette (6 colors):

3-bit packing format: Each pixel is represented by 3 bits. Every 3 bytes (24 bits) encode 8 pixels. Pixels are scanned left-to-right, top-to-bottom. Their 3-bit values are concatenated into a continuous bit stream, then split into bytes.

Example: 9 pixels with colors [Red, Yellow, Green, White, Red, Black, White, White, ...]:

• Bit stream: 010 101 011 001 010 000 001 001 ...
• Byte 1: 01010101 = 0x55
• Byte 2: 10010100 = 0x94
• Byte 3: 00001001 = 0x09

Data size comparison (e.g. 13.3" screen 1200x1600):

• Uncompressed (1 byte/pixel): 1,920,000 bytes (~1.92 MB)
• 3-bit packed: (1200 × 1600 × 3) / 8 = 720,000 bytes (~703 KB)

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28.5" Canvas (EL285TW2)

The 28.5" Canvas uses a 4-bit format with panel color codes. The 3-bit format and the 0–5 palette indexes above do not apply to this model.

• Resolution: always 2160 × 3060 (portrait), regardless of the device's rotation setting. For a landscape hang, rotate the image to portrait before packing.
• Scan order: top to bottom, left to right within each row.
• Packing: 4 bits per pixel, 2 pixels per byte. The high 4 bits are the left pixel, the low 4 bits are the right pixel. No header, no padding.
• Data size: exactly (2160 × 3060) / 2 = 3,304,800 bytes. Data of any other length is discarded and the screen is not refreshed.

Color codes:

Code 0x0 leaves the pixel unchanged from the previous image.

Example: first byte for a row starting [White, Red, ...] = 0x24.