不支持透明的图形

**Describe the bug**
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**To Reproduce**
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1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
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**Screenshots**
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**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]

**Additional context**
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The issue is a bug report template with no actual bug description. To investigate, one would need to understand the library's image processing and steganography code, likely in the main package handling image encoding/decoding. Look for methods dealing with image transparency (alpha channel) and LSB manipulation. Determine what '不支持透明的图形' (does not support transparent graphics) means in practice—perhaps PNGs with transparency fail. Write a test with a transparent image to reproduce the issue.

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