So use the "clipper" but not just end up with a harsh cut, as I want to merge this with another raster dataset and for them to blend in. or is the "Alpha Compositing: Blending Two Raster Images" method the only realistic method?
The effect i'm looking for is similar to that of a feathered lasso in Photoshop.
+4
in effect resample the overlapping part of your images to 'feather' them?
+3
Then raster combine the alpha map with your raster.
Wich is basicaly what photo software do btw.
Just wondering if anything has changed on this front in the last 5 years?
I have seen the MapnikRasterizer but blending seems awkward to set up, particularly if you have more than one layer to blend.
+2
Just wondering if anything has changed on this front in the last 5 years?
I have seen the MapnikRasterizer but blending seems awkward to set up, particularly if you have more than one layer to blend.
Hi @btl, Thanks for your question. There are a couple of methods that might be worth trying:
Here is an article explaining in more detail on how to blend two rasters: https://knowledge.safe.com/articles/1219/alpha-compositing-blending-two-raster-images.html
There is also a custom transformer in the hub, which might work better for your scenario involving multiple layers: https://hub.safe.com/transformers/rasterblendmosaicker#description
Full disclosure, I've not tried this workflow, but hopefully these resources might be helpful to you.
+1
Just wondering if anything has changed on this front in the last 5 years?
I have seen the MapnikRasterizer but blending seems awkward to set up, particularly if you have more than one layer to blend.
The MapnikRasterizer has compositing operations and uses anti-aliasing which will give you a feathered edge to a feature. Not too difficult to set up once you understand the order of layers.
Its also worth looking at the RasterConvolver which adds a whole other set of image tools, such as Gaussian Blur
+3
@btl
Option would be to use (for instance) PIL. (which appears to be in the standard install)
Here is a simple blurr script. Blurs in 8 stages
(because of issues with the show method (which is commented out in this example), i used the webbrowser apporach to view it)
import fme
import fmeobjects
import webbrowser
from PIL import Image, ImageFilter # imports the library
def huh(feature):
original = Image.open("H:\\Documents\\My Pictures\\Manneke.jpg") # load an image from the hard drive
for x in range(8):
blurred = original.filter(ImageFilter.BLUR) # blur the image
fnb = "H:\\Documents\\My Pictures\\Manneke_b_"+str(x)+".jpg"
blurred.save(fnb)
#original.show() # display both images
#blurred.show()
webbrowser.open(fnb)
#original = Image.open(fnb)
+3
@btl
Here is a belning example using PIL (replace wiht our own pics)
import fme
import fmeobjects
import webbrowser
from PIL import Image, ImageFilter # imports the library
def huh(feature):
im1= Image.open("H:\\Documents\\My Pictures\\Manneke.jpg")
im2= Image.open("H:\\Documents\\My Pictures\\Manneke_b_7.jpg")
im3= Image.open("H:\\Documents\\My Pictures\\pdfpf.png")
target_mode = im1.mode
target_size = im1.size
zero=tuple((0, 0))
crop_t= zero + target_size
print("Targetmode is "+im1.mode+ " with size "+ str(target_size) +" and sourcemode is "+im3.mode+"with size "+ str(im3.size))
im3c=im3.crop(crop_t)
im_out = Image.blend(im1, im3c, 0.5)
#im_out = Image.alpha_composite(im1, im2)
i_name = "H:\\Documents\\My Pictures\\A_comp.jpg"
im_out.save(i_name)
#webbrowser.open(i_name)
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