BGR to JPEG Converter

Raw BGR files store pixel data as sequential B, G, R byte triplets with no header, no dimensions metadata, and no compression. Open one in the wrong tool and you get noise. Specify incorrect width and the image shears diagonally. This converter reads the raw byte stream, swaps the B and R channels to produce standard RGB ordering, renders onto a Canvas element, and encodes to JPEG at a user-defined quality factor Q ∈ [0.01, 1.0]. All processing is local. No upload occurs.

The tool validates that file size equals W × H × 3 bytes before proceeding. If your BGR data uses 4-byte row padding (common in BMP-derived pipelines), enable the padding option. Note: this tool assumes 8-bit unsigned integer samples. 16-bit or float BGR data requires separate handling.

Each pixel in a raw BGR file occupies 3 consecutive bytes. The channel swap operation for pixel index i is:

The expected file size without row padding:

With 4-byte row alignment (BMP-style), each row is padded to a multiple of 4 bytes:

JPEG quality factor Q maps to the quantization table scaling inside the encoder. Q = 1.0 yields minimal quantization (largest file, best fidelity). Q = 0.01 yields aggressive quantization (smallest file, most artifacts).

Where: W = image width in pixels, H = image height in pixels, S = file size in bytes, Q = JPEG quality factor (0.01 - 1.0), stride = padded row length in bytes.