Title: Fix image vlim clipping again by tacaswell · Pull Request #17636 · matplotlib/matplotlib · GitHub
Open Graph Title: Fix image vlim clipping again by tacaswell · Pull Request #17636 · matplotlib/matplotlib
X Title: Fix image vlim clipping again by tacaswell · Pull Request #17636 · matplotlib/matplotlib
Description: PR Summary We use the Agg resampling routines to resample the user supplied data to the number of pixels we need in the final rendering. The Agg routines require that the input be in the range [0, 1] and it aggressively clips input and output to that range. Thus, we rescale the user data to [0, 1], pass it to the resampling routine and then rescale the result back to the original range. The resampled (shape wise) data is than passed to the user supplied norm to normalize the data to [0, 1] (again), and then onto the color map to get to RBGA. Due to float precision, the first re-scaling does not round-trip exactly in all casses. The error is extremely small (8-16 orders of magnitude smaller than the data) but for values that are exactly equal to the user supplied vmin or vmax this can be enough to push the data out of the "valid" gamut and be marked as "over" or "under". The colormaps default to using the top/bottom color for the over/under color so this is not visible, however if the user sets the over/under colors of the cmap this issue will be visible. closes #16910 PR Checklist Has Pytest style unit tests Code is Flake 8 compliant
Open Graph Description: PR Summary We use the Agg resampling routines to resample the user supplied data to the number of pixels we need in the final rendering. The Agg routines require that the input be in the range [0,...
X Description: PR Summary We use the Agg resampling routines to resample the user supplied data to the number of pixels we need in the final rendering. The Agg routines require that the input be in the range [0,...
Opengraph URL: https://github.com/matplotlib/matplotlib/pull/17636
X: @github
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