生成PDF
使用Python的ReportLab库将处理后的位图生成PDF文件。
以下是一个完整的Python示例代码，演示如何实现这些步骤：
python
from PIL import Image
import numpy as np
from reportlab.pdfgen import canvas
from reportlab.lib.pagesizes import letter
def create_color_gradient(color, levels=256):
"""
Create a color gradient for the specified color.
:param color: Tuple of RGB values (e.g., (255, 0, 0) for red)
:param levels: Number of gradient levels
:return: List of gradient colors
"""
gradient = []
for i in range(levels):
r = int(color[0] * (i / (levels - 1)))
g = int(color[1] * (i / (levels - 1)))
b = int(color[2] * (i / (levels - 1)))
gradient.append((r, g, b))
return gradient
def apply_color_gradient(image, gradient):
"""
Apply the color gradient to the image.
:param image: PIL Image object
:param gradient: List of gradient colors
:return: PIL Image object with applied gradient
"""
image = image.convert("L") # Convert to grayscale
image_data = np.array(image)
color_image_data = np.zeros((image_data.shape[0], image_data.shape[1], 3), dtype=np.uint8)
for i in range(image_data.shape[0]):
for j in range(image_data.shape[1]):
color_image_data[i, j] = gradient[image_data[i, j]]
color_image = Image.fromarray(color_image_data, "RGB")
return color_image
def save_image_to_pdf(image, pdf_path):
"""
Save the image to a PDF file.
:param image: PIL Image object
:param pdf_path: Path to the output PDF file
"""
c = canvas.Canvas(pdf_path, pagesize=letter)
image_path = "temp_image.png"
image.save(image_path)
c.drawImage(image_path, 0, 0, width=letter[0], height=letter[1])
c.showPage()
c.save()
def main():
# Step 1: Read the original bitmap
original_image_path = "path_to_your_bitmap_image.bmp"
image = Image.open(original_image_path)
# Step 2: Create the specified color gradient
specified_color = (255, 0, 0) # Example: red color gradient
gradient = create_color_gradient(specified_color)
# Step 3: Replace original bitmap colors with the color gradient
color_image = apply_color_gradient(image, gradient)
# Step 4: Save the result to a PDF
output_pdf_path = "output_image.pdf"
save_image_to_pdf(color_image, output_pdf_path)
print(f"PDF saved to {output_pdf_path}")
if __name__ == "__main__":
main()
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