René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Floating point image RGB values must be in the 0..1 range","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\nFrom matplorlib 2.0 to 2.1 this problem appeared: Floating point image RGB values must be in the 0..1 range, instead of producing an image with noise on it.\r\n\r\n**Code for reproduction**\r\nCan use any image to try to reproduce this problem:\r\n\r\n```python\r\nimport imageio\r\nimport numpy as np\r\nfrom matplotlib.pyplot import imshow\r\n%matplotlib inline\r\n\r\nimage_file=\"image.jpg\"\r\ncontent_image = imageio.imread(image_file)\r\n#imshow(content_image)\r\n\r\nnoise_ratio = 0.6\r\nimage_height, image_width, color_channels = content_image.shape\r\nnoise_image = np.random.uniform(-20, 20, (1, image_height, image_width, color_channels)).astype('float32')\r\ninput_image = noise_image * noise_ratio + content_image * (1 - noise_ratio)\r\nimshow(input_image[0])\r\n```\r\n\r\n**Actual outcome**\r\n```\r\n\u003cmatplotlib.image.AxesImage at 0x7fad8700b748\u003e\r\nError in callback \u003cfunction install_repl_displayhook.\u003clocals\u003e.post_execute at 0x7fad44bbb510\u003e (for post_execute):\r\n---------------------------------------------------------------------------\r\nValueError                                Traceback (most recent call last)\r\n~/.local/lib/python3.5/site-packages/matplotlib/pyplot.py in post_execute()\r\n    147             def post_execute():\r\n    148                 if matplotlib.is_interactive():\r\n--\u003e 149                     draw_all()\r\n    150 \r\n    151             # IPython \u003e= 2\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/_pylab_helpers.py in draw_all(cls, force)\r\n    134         for f_mgr in cls.get_all_fig_managers():\r\n    135             if force or f_mgr.canvas.figure.stale:\r\n--\u003e 136                 f_mgr.canvas.draw_idle()\r\n    137 \r\n    138 atexit.register(Gcf.destroy_all)\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/backend_bases.py in draw_idle(self, *args, **kwargs)\r\n   2053         if not self._is_idle_drawing:\r\n   2054             with self._idle_draw_cntx():\r\n-\u003e 2055                 self.draw(*args, **kwargs)\r\n   2056 \r\n   2057     def draw_cursor(self, event):\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/backends/backend_agg.py in draw(self)\r\n    429             # if toolbar:\r\n    430             #     toolbar.set_cursor(cursors.WAIT)\r\n--\u003e 431             self.figure.draw(self.renderer)\r\n    432         finally:\r\n    433             # if toolbar:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)\r\n     53                 renderer.start_filter()\r\n     54 \r\n---\u003e 55             return draw(artist, renderer, *args, **kwargs)\r\n     56         finally:\r\n     57             if artist.get_agg_filter() is not None:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/figure.py in draw(self, renderer)\r\n   1473 \r\n   1474             mimage._draw_list_compositing_images(\r\n-\u003e 1475                 renderer, self, artists, self.suppressComposite)\r\n   1476 \r\n   1477             renderer.close_group('figure')\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)\r\n    136     if not_composite or not has_images:\r\n    137         for a in artists:\r\n--\u003e 138             a.draw(renderer)\r\n    139     else:\r\n    140         # Composite any adjacent images together\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)\r\n     53                 renderer.start_filter()\r\n     54 \r\n---\u003e 55             return draw(artist, renderer, *args, **kwargs)\r\n     56         finally:\r\n     57             if artist.get_agg_filter() is not None:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/axes/_base.py in draw(self, renderer, inframe)\r\n   2579             renderer.stop_rasterizing()\r\n   2580 \r\n-\u003e 2581         mimage._draw_list_compositing_images(renderer, self, artists)\r\n   2582 \r\n   2583         renderer.close_group('axes')\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)\r\n    136     if not_composite or not has_images:\r\n    137         for a in artists:\r\n--\u003e 138             a.draw(renderer)\r\n    139     else:\r\n    140         # Composite any adjacent images together\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)\r\n     53                 renderer.start_filter()\r\n     54 \r\n---\u003e 55             return draw(artist, renderer, *args, **kwargs)\r\n     56         finally:\r\n     57             if artist.get_agg_filter() is not None:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in draw(self, renderer, *args, **kwargs)\r\n    566         else:\r\n    567             im, l, b, trans = self.make_image(\r\n--\u003e 568                 renderer, renderer.get_image_magnification())\r\n    569             if im is not None:\r\n    570                 renderer.draw_image(gc, l, b, im)\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in make_image(self, renderer, magnification, unsampled)\r\n    793         return self._make_image(\r\n    794             self._A, bbox, transformed_bbox, self.axes.bbox, magnification,\r\n--\u003e 795             unsampled=unsampled)\r\n    796 \r\n    797     def _check_unsampled_image(self, renderer):\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification, unsampled, round_to_pixel_border)\r\n    484             # (of int or float)\r\n    485             # or an RGBA array of re-sampled input\r\n--\u003e 486             output = self.to_rgba(output, bytes=True, norm=False)\r\n    487             # output is now a correctly sized RGBA array of uint8\r\n    488 \r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/cm.py in to_rgba(self, x, alpha, bytes, norm)\r\n    254                 if xx.dtype.kind == 'f':\r\n    255                     if norm and xx.max() \u003e 1 or xx.min() \u003c 0:\r\n--\u003e 256                         raise ValueError(\"Floating point image RGB values \"\r\n    257                                          \"must be in the 0..1 range.\")\r\n    258                     if bytes:\r\n\r\nValueError: Floating point image RGB values must be in the 0..1 range.\r\n---------------------------------------------------------------------------\r\nValueError                                Traceback (most recent call last)\r\n/usr/local/lib/python3.5/dist-packages/IPython/core/formatters.py in __call__(self, obj)\r\n    339                 pass\r\n    340             else:\r\n--\u003e 341                 return printer(obj)\r\n    342             # Finally look for special method names\r\n    343             method = get_real_method(obj, self.print_method)\r\n\r\n/usr/local/lib/python3.5/dist-packages/IPython/core/pylabtools.py in \u003clambda\u003e(fig)\r\n    236 \r\n    237     if 'png' in formats:\r\n--\u003e 238         png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs))\r\n    239     if 'retina' in formats or 'png2x' in formats:\r\n    240         png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs))\r\n\r\n/usr/local/lib/python3.5/dist-packages/IPython/core/pylabtools.py in print_figure(fig, fmt, bbox_inches, **kwargs)\r\n    120 \r\n    121     bytes_io = BytesIO()\r\n--\u003e 122     fig.canvas.print_figure(bytes_io, **kw)\r\n    123     data = bytes_io.getvalue()\r\n    124     if fmt == 'svg':\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, **kwargs)\r\n   2210                     orientation=orientation,\r\n   2211                     dryrun=True,\r\n-\u003e 2212                     **kwargs)\r\n   2213                 renderer = self.figure._cachedRenderer\r\n   2214                 bbox_inches = self.figure.get_tightbbox(renderer)\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/backends/backend_agg.py in print_png(self, filename_or_obj, *args, **kwargs)\r\n    506 \r\n    507     def print_png(self, filename_or_obj, *args, **kwargs):\r\n--\u003e 508         FigureCanvasAgg.draw(self)\r\n    509         renderer = self.get_renderer()\r\n    510         original_dpi = renderer.dpi\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/backends/backend_agg.py in draw(self)\r\n    429             # if toolbar:\r\n    430             #     toolbar.set_cursor(cursors.WAIT)\r\n--\u003e 431             self.figure.draw(self.renderer)\r\n    432         finally:\r\n    433             # if toolbar:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)\r\n     53                 renderer.start_filter()\r\n     54 \r\n---\u003e 55             return draw(artist, renderer, *args, **kwargs)\r\n     56         finally:\r\n     57             if artist.get_agg_filter() is not None:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/figure.py in draw(self, renderer)\r\n   1473 \r\n   1474             mimage._draw_list_compositing_images(\r\n-\u003e 1475                 renderer, self, artists, self.suppressComposite)\r\n   1476 \r\n   1477             renderer.close_group('figure')\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)\r\n    136     if not_composite or not has_images:\r\n    137         for a in artists:\r\n--\u003e 138             a.draw(renderer)\r\n    139     else:\r\n    140         # Composite any adjacent images together\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)\r\n     53                 renderer.start_filter()\r\n     54 \r\n---\u003e 55             return draw(artist, renderer, *args, **kwargs)\r\n     56         finally:\r\n     57             if artist.get_agg_filter() is not None:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/axes/_base.py in draw(self, renderer, inframe)\r\n   2579             renderer.stop_rasterizing()\r\n   2580 \r\n-\u003e 2581         mimage._draw_list_compositing_images(renderer, self, artists)\r\n   2582 \r\n   2583         renderer.close_group('axes')\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in _draw_list_compositing_images(renderer, parent, artists, suppress_composite)\r\n    136     if not_composite or not has_images:\r\n    137         for a in artists:\r\n--\u003e 138             a.draw(renderer)\r\n    139     else:\r\n    140         # Composite any adjacent images together\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/artist.py in draw_wrapper(artist, renderer, *args, **kwargs)\r\n     53                 renderer.start_filter()\r\n     54 \r\n---\u003e 55             return draw(artist, renderer, *args, **kwargs)\r\n     56         finally:\r\n     57             if artist.get_agg_filter() is not None:\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in draw(self, renderer, *args, **kwargs)\r\n    566         else:\r\n    567             im, l, b, trans = self.make_image(\r\n--\u003e 568                 renderer, renderer.get_image_magnification())\r\n    569             if im is not None:\r\n    570                 renderer.draw_image(gc, l, b, im)\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in make_image(self, renderer, magnification, unsampled)\r\n    793         return self._make_image(\r\n    794             self._A, bbox, transformed_bbox, self.axes.bbox, magnification,\r\n--\u003e 795             unsampled=unsampled)\r\n    796 \r\n    797     def _check_unsampled_image(self, renderer):\r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/image.py in _make_image(self, A, in_bbox, out_bbox, clip_bbox, magnification, unsampled, round_to_pixel_border)\r\n    484             # (of int or float)\r\n    485             # or an RGBA array of re-sampled input\r\n--\u003e 486             output = self.to_rgba(output, bytes=True, norm=False)\r\n    487             # output is now a correctly sized RGBA array of uint8\r\n    488 \r\n\r\n~/.local/lib/python3.5/site-packages/matplotlib/cm.py in to_rgba(self, x, alpha, bytes, norm)\r\n    254                 if xx.dtype.kind == 'f':\r\n    255                     if norm and xx.max() \u003e 1 or xx.min() \u003c 0:\r\n--\u003e 256                         raise ValueError(\"Floating point image RGB values \"\r\n    257                                          \"must be in the 0..1 range.\")\r\n    258                     if bytes:\r\n\r\nValueError: Floating point image RGB values must be in the 0..1 range.\r\n\u003cFigure size 432x288 with 1 Axes\u003e\r\n```\r\n\r\n**Expected outcome**\r\n\r\nIn matplotlib==2.0.2 and previous this code generates a image with some noise applied to it.\r\n\r\nIn matplotlib=2.1.x the error above appear.\r\n\r\n**Matplotlib version**\r\n  * Operating system: ubuntu 16.04\r\n  * Matplotlib version: 2.1.X\r\n  * Matplotlib backend (print(matplotlib.get_backend())): module://ipykernel.pylab.backend_inline\r\n  * Python version: 3.5.2\r\n  * Jupyter version (if applicable): Jupyterlab==0.30.6\r\n  * Other libraries: \r\n     \u003e numpy==1.14.0\r\n     \u003e imageio==2.2.0\r\n\r\nThe libraries are installed in pure python via pip install. I also build from the source to test if a recent unreleased version had this problem solved this but also got the same output.\r\n\r\n\r\n","author":{"url":"https://github.com/cyberwillis","@type":"Person","name":"cyberwillis"},"datePublished":"2018-02-02T17:54:16.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/10372/matplotlib/issues/10372"}