siyuan-note/siyuan · error

image exceeds pixel limit: %d

Error message

image exceeds pixel limit: %d

What it means

Decoded dimensions have width or height < 1 (invalid) OR width*height exceeds maxPixels. The guard prevents memory exhaustion and respects provider pixel caps.

Source

Thrown at kernel/util/openai.go:642

	}
	if maxBytes > 0 && len(data) > maxBytes {
		return PreparedImage{}, fmt.Errorf("image exceeds size limit: %d bytes", maxBytes)
	}
	mimeType := mimetype.Detect(data).String()
	if strings.Contains(mimeType, "svg") || bytes.Contains(bytes.ToLower(data[:min(len(data), 512)]), []byte("<svg")) {
		return PreparedImage{}, errors.New("SVG images are not accepted by multimodal models")
	}
	switch mimeType {
	case "image/gif", "image/jpeg", "image/png", "image/webp":
	default:
		return PreparedImage{}, fmt.Errorf("unsupported image type: %s", mimeType)
	}
	config, _, err := image.DecodeConfig(bytes.NewReader(data))
	if err != nil {
		return PreparedImage{}, errors.New("unsupported or invalid image: " + err.Error())
	}
	if config.Width < 1 || config.Height < 1 || maxPixels > 0 && int64(config.Width)*int64(config.Height) > int64(maxPixels) {
		return PreparedImage{}, fmt.Errorf("image exceeds pixel limit: %d", maxPixels)
	}

	decoded, err := imaging.Decode(bytes.NewReader(data), imaging.AutoOrientation(true))
	if err != nil {
		return PreparedImage{}, errors.New("decode image failed: " + err.Error())
	}
	bounds := decoded.Bounds()
	needsResize := maxEdge > 0 && (bounds.Dx() > maxEdge || bounds.Dy() > maxEdge)
	if !needsResize && bounds.Dx() == config.Width && bounds.Dy() == config.Height && mimeType != "image/gif" {
		return PreparedImage{
			Data:       data,
			MIMEType:   mimeType,
			Width:      bounds.Dx(),
			Height:     bounds.Dy(),
			SourceSize: len(data),
		}, nil
	}
	if needsResize {

View on GitHub (pinned to 251596fc0d)

Solutions

1. Downscale the source to within the provider's pixel budget before sending.
2. Reject over-large images at the UI.
3. Re-export malformed headers via an image editor.

cfg, _, _ := image.DecodeConfig(bytes.NewReader(data))
if maxPixels > 0 && int64(cfg.Width)*int64(cfg.Height) > int64(maxPixels) {
    return errors.New("downscale the image before sending")
}

func WithinPixelLimit(data []byte, maxPixels int) bool {
    cfg, _, err := image.DecodeConfig(bytes.NewReader(data))
    if err != nil { return false }
    return maxPixels <= 0 || int64(cfg.Width)*int64(cfg.Height) <= int64(maxPixels)
}

When it happens

Trigger: A very high-resolution photo (e.g. 8000x8000) exceeds the provider's megapixel cap; or a degenerate image whose header reports zero/tiny dimensions.

Common situations: Full-resolution DSLR or phone panoramas; stitched images; malformed header reporting tiny dimensions.

Related errors

• image exceeds size limit: %d bytes
• prepared image exceeds size limit: %d bytes
• image data is empty
• SVG images are not accepted by multimodal models
• unsupported image type: %s

AI-assisted analysis of siyuan-note/siyuan@251596fc0d (2026-08-12). Data as JSON: /api/errors/6c06297274388301. Report an issue: GitHub.