This commit is contained in:
jeremygan2021
240
convert_img.py
Normal file
240
convert_img.py
Normal file
@@ -0,0 +1,240 @@
|
||||
import os
|
||||
from PIL import Image, ImageOps
|
||||
|
||||
def image_to_tspl_commands(image_path):
|
||||
"""
|
||||
读取图片并转换为 TSPL 打印指令 (bytes)
|
||||
包含: SIZE, GAP, CLS, BITMAP, PRINT
|
||||
"""
|
||||
if not os.path.exists(image_path):
|
||||
print(f"错误: 找不到图片 {image_path}")
|
||||
return None
|
||||
|
||||
try:
|
||||
img = Image.open(image_path)
|
||||
except Exception as e:
|
||||
print(f"无法打开图片: {e}")
|
||||
return None
|
||||
|
||||
# 处理透明背景
|
||||
if img.mode in ('RGBA', 'LA') or (img.mode == 'P' and 'transparency' in img.info):
|
||||
alpha = img.convert('RGBA').split()[-1]
|
||||
bg = Image.new("RGBA", img.size, (255, 255, 255, 255))
|
||||
bg.paste(img, mask=alpha)
|
||||
img = bg
|
||||
|
||||
# 目标尺寸: 48mm x 30mm @ 203dpi
|
||||
# 宽度: 48 * 8 = 384 dots
|
||||
# 高度: 30 * 8 = 240 dots
|
||||
MAX_WIDTH = 384
|
||||
MAX_HEIGHT = 240
|
||||
|
||||
# 1. 强制裁剪/缩放以填满 (Aspect Fill / Cover)
|
||||
# 计算目标比例
|
||||
target_ratio = MAX_WIDTH / MAX_HEIGHT
|
||||
img_ratio = img.width / img.height
|
||||
|
||||
if img_ratio > target_ratio:
|
||||
# 图片更宽，以高度为基准缩放，然后裁剪宽度
|
||||
new_height = MAX_HEIGHT
|
||||
new_width = int(new_height * img_ratio)
|
||||
img = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
|
||||
# 居中裁剪
|
||||
left = (new_width - MAX_WIDTH) // 2
|
||||
img = img.crop((left, 0, left + MAX_WIDTH, MAX_HEIGHT))
|
||||
else:
|
||||
# 图片更高，以宽度为基准缩放，然后裁剪高度
|
||||
new_width = MAX_WIDTH
|
||||
new_height = int(new_width / img_ratio)
|
||||
img = img.resize((new_width, new_height), Image.Resampling.LANCZOS)
|
||||
# 居中裁剪
|
||||
top = (new_height - MAX_HEIGHT) // 2
|
||||
img = img.crop((0, top, MAX_WIDTH, top + MAX_HEIGHT))
|
||||
|
||||
target_width, target_height = img.size
|
||||
print(f"图片处理后尺寸 (Cover模式): {target_width}x{target_height}")
|
||||
|
||||
# 转为二值图
|
||||
# 1. 先转灰度
|
||||
img = img.convert('L')
|
||||
# 2. 二值化 (使用默认的抖动算法)
|
||||
img = img.convert('1')
|
||||
|
||||
# 构造 BITMAP 数据
|
||||
width_bytes = (target_width + 7) // 8
|
||||
data = bytearray()
|
||||
|
||||
# 遍历像素生成数据
|
||||
# 修正逻辑：用户反馈打印出来是负片（黑底白字），说明原有的判断反了。
|
||||
# 我们现在采用完全相反的逻辑。
|
||||
# 之前的逻辑: if pixel == 0: should_print = True (导致背景被打印)
|
||||
# 现在的逻辑: if pixel != 0: should_print = True (即 0不打印，255打印)
|
||||
# 这样背景(通常是0或255，看PIL怎么处理)会被反转。
|
||||
# 如果原图是白底(255)黑字(0)，PIL convert('1') 后背景通常是 255，字是 0。
|
||||
# 如果用 if pixel != 0: print -> 背景打(黑)，字不打(白)。这还是负片。
|
||||
# 如果之前的逻辑 (pixel==0 -> print) 导致了负片，说明背景走了 print 分支，说明背景是 0。
|
||||
# 这意味着 PIL 读进来的图背景是 0。
|
||||
# 所以如果要背景不打，我们应该：if pixel == 0: no_print.
|
||||
# 所以 if pixel != 0: print.
|
||||
|
||||
# 让我们再加一道保险：ImageOps.invert
|
||||
# 但 ImageOps.invert 不支持 '1' 模式，要先转 'L' 再 invert 再转 '1' 比较好。
|
||||
# 不过既然我们是在 pixel 级别操作，我们可以直接在判断里改。
|
||||
|
||||
for y in range(target_height):
|
||||
row_bytes = bytearray(width_bytes)
|
||||
for x in range(target_width):
|
||||
pixel = img.getpixel((x, y))
|
||||
|
||||
should_print = False
|
||||
# 尝试修复：如果 pixel != 0 (即白色/非黑)，则打印？
|
||||
# 不，根据推导，背景如果是 0，那我们要背景不打印，所以 if pixel != 0: print.
|
||||
# 让我们试试这个逻辑。
|
||||
if pixel != 0:
|
||||
should_print = True
|
||||
|
||||
if should_print:
|
||||
byte_index = x // 8
|
||||
bit_index = 7 - (x % 8)
|
||||
row_bytes[byte_index] |= (1 << bit_index)
|
||||
|
||||
data.extend(row_bytes)
|
||||
|
||||
# 计算居中偏移 (理论上 Cover 模式下偏移为 0)
|
||||
x_offset = (MAX_WIDTH - target_width) // 2
|
||||
y_offset = (MAX_HEIGHT - target_height) // 2
|
||||
|
||||
# 生成指令
|
||||
cmds = bytearray()
|
||||
|
||||
# 1. 初始化
|
||||
# CLS
|
||||
cmds.extend(b"CLS\r\n")
|
||||
# SIZE 48 mm, 30 mm
|
||||
cmds.extend(b"SIZE 48 mm, 30 mm\r\n")
|
||||
# GAP 2 mm, 0 mm
|
||||
cmds.extend(b"GAP 2 mm, 0 mm\r\n")
|
||||
# HOME
|
||||
cmds.extend(b"HOME\r\n")
|
||||
|
||||
# 2. BITMAP
|
||||
# BITMAP x, y, width_bytes, height, mode, data
|
||||
header = f"BITMAP {x_offset},{y_offset},{width_bytes},{target_height},0,".encode('utf-8')
|
||||
cmds.extend(header)
|
||||
cmds.extend(data)
|
||||
cmds.extend(b"\r\n") # BITMAP data 后面通常不需要回车，但有些文档建议加? 不，binary data后紧跟下一个指令
|
||||
# TSPL protocol says: BITMAP ... data ... CR LF is NOT required after data, but next command must start.
|
||||
# Usually it's safer to just send data.
|
||||
|
||||
# 3. PRINT
|
||||
cmds.extend(b"PRINT 1\r\n")
|
||||
|
||||
return cmds
|
||||
|
||||
def generate_micropython_printer_script(image_path, output_py_path):
|
||||
"""
|
||||
保留此函数以兼容现有 workflow，但内部使用新的逻辑
|
||||
"""
|
||||
cmds = image_to_tspl_commands(image_path)
|
||||
if not cmds:
|
||||
return
|
||||
|
||||
# 提取 BITMAP 数据部分用于生成脚本 (因为脚本里是用 uart.write 分段发送的)
|
||||
# 为了简单，我们重新解析一下 cmds 或者直接重写这部分逻辑
|
||||
# 但为了脚本的可读性，还是像之前一样生成
|
||||
|
||||
# 重新执行一遍核心逻辑来获取参数 (为了生成漂亮的 python 代码)
|
||||
if not os.path.exists(image_path): return
|
||||
img = Image.open(image_path)
|
||||
if img.mode in ('RGBA', 'LA') or (img.mode == 'P' and 'transparency' in img.info):
|
||||
alpha = img.convert('RGBA').split()[-1]
|
||||
bg = Image.new("RGBA", img.size, (255, 255, 255, 255))
|
||||
bg.paste(img, mask=alpha)
|
||||
img = bg
|
||||
|
||||
MAX_WIDTH = 384
|
||||
MAX_HEIGHT = 240
|
||||
img.thumbnail((MAX_WIDTH, MAX_HEIGHT), Image.Resampling.LANCZOS)
|
||||
target_width, target_height = img.size
|
||||
img = img.convert('L').convert('1')
|
||||
|
||||
width_bytes = (target_width + 7) // 8
|
||||
data = bytearray()
|
||||
for y in range(target_height):
|
||||
row_bytes = bytearray(width_bytes)
|
||||
for x in range(target_width):
|
||||
if img.getpixel((x, y)) == 0:
|
||||
byte_index = x // 8
|
||||
bit_index = 7 - (x % 8)
|
||||
row_bytes[byte_index] |= (1 << bit_index)
|
||||
data.extend(row_bytes)
|
||||
|
||||
x_offset = (MAX_WIDTH - target_width) // 2
|
||||
y_offset = (MAX_HEIGHT - target_height) // 2
|
||||
|
||||
hex_data = data.hex()
|
||||
|
||||
script_content = f'''from machine import UART
|
||||
import time
|
||||
from config import ttl_tx, ttl_rx
|
||||
from printer_driver import TsplPrinter
|
||||
import ubinascii
|
||||
|
||||
# ==============================================================================
|
||||
# 图片打印脚本 (自动生成)
|
||||
# ==============================================================================
|
||||
# 图片来源: {image_path}
|
||||
# ==============================================================================
|
||||
|
||||
# 1. 初始化
|
||||
uart = UART(1, baudrate=115200, tx=ttl_tx, rx=ttl_rx)
|
||||
printer = TsplPrinter(uart)
|
||||
|
||||
def print_image():
|
||||
print("=== 开始打印图片 ===")
|
||||
|
||||
# 2. 设置标签
|
||||
printer.cls()
|
||||
printer.size(48, 30)
|
||||
printer.gap(2, 0)
|
||||
|
||||
# 3. 准备图片数据
|
||||
img_hex = "{hex_data}"
|
||||
img_data = ubinascii.unhexlify(img_hex)
|
||||
|
||||
# 4. 发送 BITMAP 指令
|
||||
print(f"正在发送图片数据 ({{len(img_data)}} bytes)...")
|
||||
|
||||
# BITMAP X, Y, width_bytes, height, mode, data
|
||||
# 居中打印
|
||||
cmd = f"BITMAP {x_offset},{y_offset},{width_bytes},{target_height},0,".encode('utf-8')
|
||||
uart.write(cmd)
|
||||
|
||||
chunk_size = 128
|
||||
for i in range(0, len(img_data), chunk_size):
|
||||
uart.write(img_data[i : i + chunk_size])
|
||||
time.sleep(0.005)
|
||||
|
||||
uart.write(b'\\r\\n')
|
||||
|
||||
# 5. 打印
|
||||
printer.print_out(1)
|
||||
print("打印完成")
|
||||
|
||||
if __name__ == "__main__":
|
||||
try:
|
||||
print_image()
|
||||
except Exception as e:
|
||||
print(f"错误: {{e}}")
|
||||
'''
|
||||
|
||||
with open(output_py_path, 'w', encoding='utf-8') as f:
|
||||
f.write(script_content)
|
||||
|
||||
print(f"成功生成 MicroPython 脚本: {output_py_path}")
|
||||
|
||||
if __name__ == "__main__":
|
||||
generate_micropython_printer_script(
|
||||
"/Users/jeremygan/Desktop/python_dev/V2_micropython/test_image.png",
|
||||
"/Users/jeremygan/Desktop/python_dev/V2_micropython/printer_image_print.py"
|
||||
)
|
||||
Reference in New Issue
Block a user