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贴图Alpha通道的对图片大小的影响”导航项", "citation": "https://www.pystone.net/notes/game-graphics-and-runtime/#%E6%88%91%E7%9A%84uwa%E9%97%AE%E7%AD%94" } ], "contentMarkdown": "# 贴图Alpha通道的对图片大小的影响\n\n> [!note] 我的 UWA 问答\n> 本文收录我在 UWA 问答发表的公开回答。问题内容归原提问者；回答保留当时语境，技术结论可能受 Unity 版本、平台和项目条件限制。\n\n## 问题\n\nhttps://blog.uwa4d.com/archives/UWA_Pipeline19.html\n\n在 UWA 的这篇文章中，描述了图片含有 Alpha 通道的话，会对内存有影响\n\n#### 以下是测试资源配置\n\n- Tga_Alpha - 含有 Alpha 通道\n- Tga_NoAlpha - 不含有 Alpha 通道\n- Png_Trans - 含有透明的图片\n- 进入到 Unity 中的 Format，全部代码设置为 TextureImporterFormat.ASTC_6x6\n\n#### 测试结果\n\n- 三张图片 Unity 全部 Format 为下图格式\n- 三张图片显示的内存大小全部一样\n- Texture Importer 的 Alpha Source 设置为 None, 对测试结果无影响\n- ![image.png](assets/5fa25e7cdc477370c2c1f015/01.png)\n\n#### 问题\n\n图片是否含有 Alpha 通道，对于同一个 Format 格式，内存大小都是一样的\n\n[Tex.7z](https://uwa-public.oss-cn-beijing.aliyuncs.com/answer/attachment/public/112946/1604477064644.7z)\n\n- 提问者：什么时候才能支持注销\n- 提问时间：2020-11-04 23:55:40\n\n## 我的回答\n\n游戏运行时Texture的alpha通道要看导入后的情况，不能看源文件的情况。UWA本地资源检测对于Texture的Alpha通道检测的就是导入后的结果。\n\n图片源文件的格式，图形硬件是不支持的，Unity也不直接接管。导入图片后，会按照Import Settings中的设置对图片进行处理，将图片导入成硬件支持的格式（在引擎中的格式），而在运行中使用的资源也是导入后的。\n\n题主将 Alpha Source 设置为 None，那么导入时就不对源文件的Alpha通道进行导入，而压缩格式为ASTC_6x6，这个格式是包含Alpha通道的。这样导入后三个资源都会默认生成一个全为1的alpha通道。占用内存大小自然一样。\n\n- 回答时间：2020-11-05 01:57:58\n- 最后更新：2020-11-05 01:57:58\n- 采纳状态：未采纳\n\n## 来源与关系\n\n- 上位集合：[[10-计算机、信息技术与工程/05-游戏图形与运行时/我的UWA问答/我的UWA问答|我的 UWA 问答]]\n- UWA 标签：资源管理\n- 原始问题：[贴图Alpha通道的对图片大小的影响](https://answer.uwa4d.com/question/5fa25e7cdc477370c2c1f015)\n- 源页最后更新：2020-11-05 02:21:34\n" }