基于Python开发PDF转PNG的可视化工具

def parse_page_range(self, page_str):
    """智能页码范围解析"""
    pages = []
    parts = page_str.split(',')
    for part in parts:
        part = part.strip()
        if '-' in part:
            start, end = part.split('-', 1)
            # 转换为0-based索引
            start_idx = int(start) - 1
            end_idx = int(end) - 1
            pages.extend(range(start_idx, end_idx+1))
        else:
            pages.append(int(part)-1)
    # 去重排序并验证范围
    return sorted(list(set(pages)))

def convert_pages(self, pages):
    doc = fitz.open(self.pdf_path)
    zoom = int(self.dpi_spin.get()) / 72  # DPI转换系数
    matrix = fitz.Matrix(zoom, zoom)
    
    for page_num in pages:
        page = doc.load_page(page_num)
        pix = page.get_pixmap(matrix=matrix)
        pix.save(f"page_{page_num+1}.png")

Thread(target=self.convert_pages, 
       args=(pages,), 
       daemon=True).start()

try:
    with fitz.open(self.pdf_path) as doc:
        # 正常流程
except fitz.FileDataError:
    messagebox.showerror("文件已损坏")
except Exception as e:
    # 通用异常捕获
finally:
    self.running = False  # 状态复位

matrix = fitz.Matrix(zoom, zoom).prescale(2, 2)  # 抗锯齿优化
pix = page.get_pixmap(
    matrix=matrix,
    alpha=False,  # 禁用透明通道
    colorspace="rgb"  # 标准色彩空间
)