Python PIL字節到圖像

Question

import PIL
from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import urllib.request

with urllib.request.urlopen('http://pastebin.ca/raw/2311595') as in_file:
    hex_data = in_file.read()
print(hex_data)
img = Image.frombuffer('RGB', (320,240), hex_data) #i have tried fromstring
draw = ImageDraw.Draw(img)
font = ImageFont.truetype("arial.ttf",14)
draw.text((0, 220),"This is a test11",(255,255,0),font=font)
draw = ImageDraw.Draw(img)
img.save("a_test.jpg")

即時嘗試將二進制轉換為圖像，然后繪制文本。但我得到錯誤：

img = Image.frombuffer('RGB', (320,240), hex_data) 
raise ValueError("not enough image data")
ValueError: not enough image data

我已經在這里上傳了字節字符串http://pastebin.ca/raw/2311595
和圖片大小我可以肯定是320x240

額外

這里是我可以肯定的圖片字節字符串是來自320x240，只需運行代碼就會從字節字符串中創建一個圖像

import urllib.request
import binascii
import struct

# Download the data.
with urllib.request.urlopen('http://pastebin.ca/raw/2311595') as in_file:
     hex_data = in_file.read()
# Unhexlify the data.
bin_data = binascii.unhexlify(hex_data)
print(bin_data)
# Remove the embedded lengths.
jpeg_data = bin_data
# Write out the JPEG.
with open('out.jpg', 'wb') as out_file:
    out_file.write(jpeg_data)

已解決，這是更新的代碼

from PIL import Image
from PIL import ImageDraw
from PIL import ImageFont
import urllib.request
import io
import binascii

data = urllib.request.urlopen('http://pastebin.ca/raw/2311595').read()
r_data = binascii.unhexlify(data)
#r_data = "".unhexlify(chr(int(b_data[i:i+2],16)) for i in range(0, len(b_data),2))

stream = io.BytesIO(r_data)

img = Image.open(stream)
draw = ImageDraw.Draw(img)
font = ImageFont.truetype("arial.ttf",14)
draw.text((0, 220),"This is a test11",(255,255,0),font=font)
draw = ImageDraw.Draw(img)
img.save("a_test.png")

Answer 1

該圖像不是由原始字節組成的 - 而是一個編碼的JPEG文件。 此外，您沒有將流的ascii HEX表示解析為正確的字節：也就是說，該文件中的“ff”序列作為兩個c字母“f”而不是帶有數字255的字節傳遞給PIL。

所以，首先，你將字符串解碼為正確的字節序列 - 對於卷積感到遺憾 - 可能有更好的方法來做到這一點，但我在一個緩慢的日子：

data = urllib.urlopen("http://pastebin.ca/raw/2311595").read()
r_data = "".join(chr(int(data[i:i+2],16)) for i in range(0, len(data),2)) 

啊，CY發表了評論 - 這樣：

>>> import binascii
>>> b_data = binascii.unhexlify(data)

現在，您將其作為JPEG圖像導入PIL：

>>> from PIL import Image
>>> import cStringIO as StringIO
>>> stream = StringIO.StringIO(b_data)
>>> img = Image.open(stream)
>>> img.size
(320, 240)

Answer 2

正如其他人所說，Python 3更好地使用io.BytesIO

import io
from PIL import Image

imageFileObj = open(imageFilename, "rb")
imageBinaryBytes = imageFileObj.read()
imageStream = io.BytesIO(imageBinaryBytes)
imageFile = Image.open(imageStream)
print("imageFile.size=%s" % imageFile.size)