diff --git a/docs/changelog.rst b/docs/changelog.rst
index a31a0d3a..e3b62dae 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -1,5 +1,16 @@
Changelog
=========
+1.0.2
+-----
+Bug fixes
+~~~~~~~~~
+- A full dataset is no longer read into memory when using ``HistogramWidget``.
+ Only the current slice is loaded.
+
+Changes
+~~~~~~~
+- Histogram bin limits are now caclualted from the slice being histogrammed, and
+ not the whole dataset. This is as a result of the above bug fix.
1.0.1
-----
diff --git a/src/napari_matplotlib/histogram.py b/src/napari_matplotlib/histogram.py
index 39ad41a3..ab098f38 100644
--- a/src/napari_matplotlib/histogram.py
+++ b/src/napari_matplotlib/histogram.py
@@ -33,7 +33,6 @@ def draw(self) -> None:
Clear the axes and histogram the currently selected layer/slice.
"""
layer = self.layers[0]
- bins = np.linspace(np.min(layer.data), np.max(layer.data), 100)
if layer.data.ndim - layer.rgb == 3:
# 3D data, can be single channel or RGB
@@ -41,6 +40,12 @@ def draw(self) -> None:
self.axes.set_title(f"z={self.current_z}")
else:
data = layer.data
+ # Read data into memory if it's a dask array
+ data = np.asarray(data)
+
+ # Important to calculate bins after slicing 3D data, to avoid reading
+ # whole cube into memory.
+ bins = np.linspace(np.min(data), np.max(data), 100)
if layer.rgb:
# Histogram RGB channels independently
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