How do you pass an image from Wand to Pillow?
I'm trying to do some OCR work. pytesseract doesn't play nicely with Wand images, but Python Image Library can't do some of the image transforms I want to do that make the OCR perform better.
At the moment, I'm using Wand to open the image, do my ImageMagick transforms, then saving it to a temp file which I then open using Pillow and pass to pytesseract. Is there a way I can do this without using a temp file? I'd like to be able to handle this all using functions that can't potentially foul each other up if they're running in parallel.
python python-imaging-library wand
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
|
show 3 more comments
I'm trying to do some OCR work. pytesseract doesn't play nicely with Wand images, but Python Image Library can't do some of the image transforms I want to do that make the OCR perform better.
At the moment, I'm using Wand to open the image, do my ImageMagick transforms, then saving it to a temp file which I then open using Pillow and pass to pytesseract. Is there a way I can do this without using a temp file? I'd like to be able to handle this all using functions that can't potentially foul each other up if they're running in parallel.
python python-imaging-library wand
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
Instead of a temp file - can you save it to aBytesIOobject instead and and pass that as the input to pillow?
– Jon Clements♦
Nov 21 '18 at 17:27
I tried that, but I keep getting "BlobError: zero-length blob not permitted `' @ error/blob.c/BlobToImage/348"
– futuraprime
Nov 21 '18 at 17:33
Can you show the code you're using for that in your question then? (eg - creating the BytesIO - saving to it, then trying to read from it?)
– Jon Clements♦
Nov 21 '18 at 17:34
Actually, this does work. It fails the other way, which I'd like to do but don't need; that code is:In [110]: with io.BytesIO() as output: ⁋ region.save(output, format=i.format) ⁋ wimg = WandImage(blob=output)
– futuraprime
Nov 21 '18 at 17:35
You've already solved it then?
– Jon Clements♦
Nov 21 '18 at 17:38
|
show 3 more comments
I'm trying to do some OCR work. pytesseract doesn't play nicely with Wand images, but Python Image Library can't do some of the image transforms I want to do that make the OCR perform better.
At the moment, I'm using Wand to open the image, do my ImageMagick transforms, then saving it to a temp file which I then open using Pillow and pass to pytesseract. Is there a way I can do this without using a temp file? I'd like to be able to handle this all using functions that can't potentially foul each other up if they're running in parallel.
python python-imaging-library wand
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
I'm trying to do some OCR work. pytesseract doesn't play nicely with Wand images, but Python Image Library can't do some of the image transforms I want to do that make the OCR perform better.
At the moment, I'm using Wand to open the image, do my ImageMagick transforms, then saving it to a temp file which I then open using Pillow and pass to pytesseract. Is there a way I can do this without using a temp file? I'd like to be able to handle this all using functions that can't potentially foul each other up if they're running in parallel.
python python-imaging-library wand
python python-imaging-library wand
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
edited Nov 21 '18 at 18:03
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
asked Nov 21 '18 at 17:25
futuraprime
3,05042336
3,05042336
Instead of a temp file - can you save it to aBytesIOobject instead and and pass that as the input to pillow?
– Jon Clements♦
Nov 21 '18 at 17:27
I tried that, but I keep getting "BlobError: zero-length blob not permitted `' @ error/blob.c/BlobToImage/348"
– futuraprime
Nov 21 '18 at 17:33
Can you show the code you're using for that in your question then? (eg - creating the BytesIO - saving to it, then trying to read from it?)
– Jon Clements♦
Nov 21 '18 at 17:34
Actually, this does work. It fails the other way, which I'd like to do but don't need; that code is:In [110]: with io.BytesIO() as output: ⁋ region.save(output, format=i.format) ⁋ wimg = WandImage(blob=output)
– futuraprime
Nov 21 '18 at 17:35
You've already solved it then?
– Jon Clements♦
Nov 21 '18 at 17:38
|
show 3 more comments
Instead of a temp file - can you save it to aBytesIOobject instead and and pass that as the input to pillow?
– Jon Clements♦
Nov 21 '18 at 17:27
I tried that, but I keep getting "BlobError: zero-length blob not permitted `' @ error/blob.c/BlobToImage/348"
– futuraprime
Nov 21 '18 at 17:33
Can you show the code you're using for that in your question then? (eg - creating the BytesIO - saving to it, then trying to read from it?)
– Jon Clements♦
Nov 21 '18 at 17:34
Actually, this does work. It fails the other way, which I'd like to do but don't need; that code is:In [110]: with io.BytesIO() as output: ⁋ region.save(output, format=i.format) ⁋ wimg = WandImage(blob=output)
– futuraprime
Nov 21 '18 at 17:35
You've already solved it then?
– Jon Clements♦
Nov 21 '18 at 17:38
Instead of a temp file - can you save it to a
BytesIO object instead and and pass that as the input to pillow?– Jon Clements♦
Nov 21 '18 at 17:27
Instead of a temp file - can you save it to a
BytesIO object instead and and pass that as the input to pillow?– Jon Clements♦
Nov 21 '18 at 17:27
I tried that, but I keep getting "BlobError: zero-length blob not permitted `' @ error/blob.c/BlobToImage/348"
– futuraprime
Nov 21 '18 at 17:33
I tried that, but I keep getting "BlobError: zero-length blob not permitted `' @ error/blob.c/BlobToImage/348"
– futuraprime
Nov 21 '18 at 17:33
Can you show the code you're using for that in your question then? (eg - creating the BytesIO - saving to it, then trying to read from it?)
– Jon Clements♦
Nov 21 '18 at 17:34
Can you show the code you're using for that in your question then? (eg - creating the BytesIO - saving to it, then trying to read from it?)
– Jon Clements♦
Nov 21 '18 at 17:34
Actually, this does work. It fails the other way, which I'd like to do but don't need; that code is:
In [110]: with io.BytesIO() as output: ⁋ region.save(output, format=i.format) ⁋ wimg = WandImage(blob=output)– futuraprime
Nov 21 '18 at 17:35
Actually, this does work. It fails the other way, which I'd like to do but don't need; that code is:
In [110]: with io.BytesIO() as output: ⁋ region.save(output, format=i.format) ⁋ wimg = WandImage(blob=output)– futuraprime
Nov 21 '18 at 17:35
You've already solved it then?
– Jon Clements♦
Nov 21 '18 at 17:38
You've already solved it then?
– Jon Clements♦
Nov 21 '18 at 17:38
|
show 3 more comments
1 Answer
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To go from Wand to PIL, you can use io.BytesIO:
with io.BytesIO() as transfer:
with WandImage(filename=fpath) as img:
img.unsharp_mask(radius=2, sigma=0, amount=75, threshold=2)
img.level(black=150/255, white=202/255, gamma=2.1)
img.save(transfer)
with Image.open(transfer) as img:
text = pytesseract.image_to_string(img)
with open('./%s/%s-tess4.txt' % (outputdir, fname), 'w+') as f:
f.write(text)
This does not seem to work to move a PIL image into Wand, however.
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
add a comment |
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oldest
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votes
To go from Wand to PIL, you can use io.BytesIO:
with io.BytesIO() as transfer:
with WandImage(filename=fpath) as img:
img.unsharp_mask(radius=2, sigma=0, amount=75, threshold=2)
img.level(black=150/255, white=202/255, gamma=2.1)
img.save(transfer)
with Image.open(transfer) as img:
text = pytesseract.image_to_string(img)
with open('./%s/%s-tess4.txt' % (outputdir, fname), 'w+') as f:
f.write(text)
This does not seem to work to move a PIL image into Wand, however.
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
add a comment |
To go from Wand to PIL, you can use io.BytesIO:
with io.BytesIO() as transfer:
with WandImage(filename=fpath) as img:
img.unsharp_mask(radius=2, sigma=0, amount=75, threshold=2)
img.level(black=150/255, white=202/255, gamma=2.1)
img.save(transfer)
with Image.open(transfer) as img:
text = pytesseract.image_to_string(img)
with open('./%s/%s-tess4.txt' % (outputdir, fname), 'w+') as f:
f.write(text)
This does not seem to work to move a PIL image into Wand, however.
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
add a comment |
To go from Wand to PIL, you can use io.BytesIO:
with io.BytesIO() as transfer:
with WandImage(filename=fpath) as img:
img.unsharp_mask(radius=2, sigma=0, amount=75, threshold=2)
img.level(black=150/255, white=202/255, gamma=2.1)
img.save(transfer)
with Image.open(transfer) as img:
text = pytesseract.image_to_string(img)
with open('./%s/%s-tess4.txt' % (outputdir, fname), 'w+') as f:
f.write(text)
This does not seem to work to move a PIL image into Wand, however.
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
To go from Wand to PIL, you can use io.BytesIO:
with io.BytesIO() as transfer:
with WandImage(filename=fpath) as img:
img.unsharp_mask(radius=2, sigma=0, amount=75, threshold=2)
img.level(black=150/255, white=202/255, gamma=2.1)
img.save(transfer)
with Image.open(transfer) as img:
text = pytesseract.image_to_string(img)
with open('./%s/%s-tess4.txt' % (outputdir, fname), 'w+') as f:
f.write(text)
This does not seem to work to move a PIL image into Wand, however.
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
answered Nov 21 '18 at 17:44
futuraprime
3,05042336
3,05042336
add a comment |
add a comment |
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Instead of a temp file - can you save it to a
BytesIOobject instead and and pass that as the input to pillow?– Jon Clements♦
Nov 21 '18 at 17:27
I tried that, but I keep getting "BlobError: zero-length blob not permitted `' @ error/blob.c/BlobToImage/348"
– futuraprime
Nov 21 '18 at 17:33
Can you show the code you're using for that in your question then? (eg - creating the BytesIO - saving to it, then trying to read from it?)
– Jon Clements♦
Nov 21 '18 at 17:34
Actually, this does work. It fails the other way, which I'd like to do but don't need; that code is:
In [110]: with io.BytesIO() as output: ⁋ region.save(output, format=i.format) ⁋ wimg = WandImage(blob=output)– futuraprime
Nov 21 '18 at 17:35
You've already solved it then?
– Jon Clements♦
Nov 21 '18 at 17:38