I have hundreds of layers. I'd like to be able export each one as a PNG. I can do this by selecting one, and going to project, export map to image, calculate from layer -> select layer -> save. Is there any way I can export all of them as seperate PNG files as a batch process?
I have made progress with the python code below. Unfortunately they are all just white 5k png files.
# create image
img = QImage(QSize(800, 800), QImage.Format_ARGB32_Premultiplied)
set background color
color = QColor(255, 255, 255, 255)
img.fill(color.rgba())
create painter
p = QPainter()
p.begin(img)
p.setRenderHint(QPainter.Antialiasing)
create map settings
ms = QgsMapSettings()
ms.setBackgroundColor(color)
set layers to render
#layer = QgsProject.instance().mapLayersByName('stream_order')
#ms.setLayers([layer[0]])
#get all map layers:
layers = QgsProject.instance().mapLayers().values()
#loop through layers
for layer in layers:
# set extent
rect = QgsRectangle(ms.fullExtent())
rect.scale(1.1)
ms.setExtent(rect)
# set ouptut size
ms.setOutputSize(img.size())
# setup qgis map renderer
render = QgsMapRendererCustomPainterJob(ms, p)
render.start()
render.waitForFinished()
p.end()
# save the image
img.save("C:/imageexport/"+layer.name()+".png")
print('image saved')
replacing rect = QgsRectangle(ms.fullExtent()) with rect = QgsRectangle(layer.extent()) seemed like the logical solution if the issue was the extent being too big, but this just causes QGIS to crash instantly.
I tried the following code and just got a completely black image.
#image_location = os.path.join(QgsProject.instance().homePath(), "render.png")
vlayer = iface.activeLayer()
#vlayer = QgsProject.instance().mapLayersByName("id_")[0]
options = QgsMapSettings()
options.setLayers([vlayer])
options.setBackgroundColor(QColor(255, 255, 255))
options.setOutputSize(QSize(2000, 2000))
options.setExtent(vlayer.extent())
render = QgsMapRendererParallelJob(options)
def finished():
img = render.renderedImage()
img.save("C:/Users/smallfing.FINGBIAL/Documents/SHEFFIELD/Road PNG Export/render.png","png")
#img.save(image_location, "png")
print("saved")
render.finished.connect(finished)
render.start()
