tonhowtf/omniget · error

não gravei o PNG

Error message

não gravei o PNG {}: {}

What it means

The PNG branch of `save_image`: if `img.save_with_format(dest, ImageFormat::Png)` fails, the error is wrapped as 'não gravei o PNG {path}: {e}'. It means PNG serialization or file writing of the processed image failed.

Solutions

1. Inspect the wrapped image::ImageError/IO error: fix disk space or permissions on the destination path.
2. Ensure the destination directory exists and the filename is valid for the OS (no reserved characters).
3. For very large images, cap dimensions (e.g. via cap_width) or switch to JPEG output before retrying.

Example fix

// before
let dest = Path::new("/only-readable/out.png");
save_image(&img, dest, 90)?; // não gravei o PNG ...
// after
let dest = home_dir().join("Pictures").join("omniget-out.png");
std::fs::create_dir_all(dest.parent().unwrap())?;
save_image(&img, &dest, 90)?;

let dir = dest.parent().unwrap();
if !dir.is_dir() { std::fs::create_dir_all(dir)?; }
let probe = dir.join(".write_probe");
std::fs::write(&probe, b"").map_err(|e| format!("destino sem permissão: {e}"))?
;let _ = std::fs::remove_file(&probe);

if let Err(e) = save_image(&img, dest, quality) {
    if e.to_string().contains("não gravei o PNG") {
        eprintln!("falha ao escrever PNG em {}: {e:#}", dest.display());
        // retry with reduced dimensions or alternate path
    }
}

When it happens

Trigger: Calling `save_image` with a non-JPEG destination where PNG saving fails — disk full, permission denied on the destination, invalid/unwritable path, or image dimensions exceeding PNG encoder limits.

Common situations: Saving into a read-only directory or one deleted mid-run; extremely large stitched images hitting encoder limits; destination filename with illegal characters on the platform.

Understand the failure class

Background: "failed to write file", "Could not save figure", "Error saving remote file" — file write failed: causes and fixes across languages and libraries — this error's family across 38 libraries.

Related errors

• não gravei o PNG
• não gravei o PNG
• não gravei o JPEG
• não abri
• amostra

AI-assisted analysis of tonhowtf/omniget@8600b91f42 (2026-09-12). Data as JSON: /api/errors/a07e698ad4b3e0de. Report an issue: GitHub.

Appendix: source

Thrown at src-tauri/omniget-core/src/core/tools/img_bg.rs:359

        "png"
    }
}

fn save_image(img: &DynamicImage, dest: &Path, ext: &str, quality: u8) -> anyhow::Result<u64> {
    if let Some(parent) = dest.parent() {
        std::fs::create_dir_all(parent).with_context(|| format!("criando {}", parent.display()))?;
    }
    if ext == "jpg" {
        let file =
            std::fs::File::create(dest).with_context(|| format!("criando {}", dest.display()))?;
        let mut w = std::io::BufWriter::new(file);
        let mut enc =
            image::codecs::jpeg::JpegEncoder::new_with_quality(&mut w, quality.clamp(1, 100));
        enc.encode_image(&img.to_rgb8())
            .map_err(|e| anyhow!("não gravei o JPEG {}: {}", dest.display(), e))?;
    } else {
        img.save_with_format(dest, image::ImageFormat::Png)
            .map_err(|e| anyhow!("não gravei o PNG {}: {}", dest.display(), e))?;
    }
    Ok(std::fs::metadata(dest).map(|m| m.len()).unwrap_or(0))
}

// ── Execução ───────────────────────────────────────────────────────────

/// Roda a inferência num arquivo já aberto e devolve a máscara no tamanho
/// original da imagem.
fn mask_for_image(
    session: &mut ort::session::Session,
    img: &DynamicImage,
    p: &BgParams,
) -> anyhow::Result<GrayImage> {
    let side = p.size as i64;
    // O `ort` traz um `ndarray` próprio (0.17) e o crate usa o 0.16, então o
    // tensor atravessa a fronteira como forma + dados contíguos, que é o que o
    // `Tensor::from_array` aceita sem depender de versão de crate nenhuma.
    let (data, _) = normalize_input(img, p).into_raw_vec_and_offset();

View on GitHub (pinned to 8600b91f42)