keras-team/keras · error · ValueError

Invalid images dtype: expected float dtype. Received: images

Error message

Invalid images dtype: expected float dtype. Received: images.dtype={backend.standardize_dtype(dtype)}

What it means

Error "Invalid images dtype: expected float dtype. Received: images.dtype={backend.standardize_dtype(dtype)}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/numpy/image.py:138

        rgb_planes_to_hsv_planes(red, green, blue), axis=channels_axis
    )
    return images.astype(dtype)


def hsv_to_rgb(images, data_format=None):
    # Ref: dm_pix
    images = convert_to_tensor(images)
    dtype = images.dtype
    data_format = backend.standardize_data_format(data_format)
    channels_axis = -1 if data_format == "channels_last" else -3
    if len(images.shape) not in (3, 4):
        raise ValueError(
            "Invalid images rank: expected rank 3 (single image) "
            "or rank 4 (batch of images). Received input with shape: "
            f"images.shape={images.shape}"
        )
    if not backend.is_float_dtype(dtype):
        raise ValueError(
            "Invalid images dtype: expected float dtype. "
            f"Received: images.dtype={backend.standardize_dtype(dtype)}"
        )
    hue, saturation, value = np.split(images, 3, channels_axis)
    hue = np.squeeze(hue, channels_axis)
    saturation = np.squeeze(saturation, channels_axis)
    value = np.squeeze(value, channels_axis)

    def hsv_planes_to_rgb_planes(hue, saturation, value):
        dh = np.mod(hue, 1.0) * 6.0
        dr = np.clip(np.abs(dh - 3.0) - 1.0, 0.0, 1.0)
        dg = np.clip(2.0 - np.abs(dh - 2.0), 0.0, 1.0)
        db = np.clip(2.0 - np.abs(dh - 4.0), 0.0, 1.0)
        one_minus_s = 1.0 - saturation

        red = value * (one_minus_s + saturation * dr)
        green = value * (one_minus_s + saturation * dg)
        blue = value * (one_minus_s + saturation * db)

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/numpy/image.py:138 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of keras-team/keras@7a34a03db6 (2026-08-25). Data as JSON: /api/errors/9872f3360e5e4b3d. Report an issue: GitHub.