文章目录[隐藏]
高清修复、优化细节、无损放大，3种快速提高AI绘画分辨率的方式，十分钟讲完！
图片糊、细节差？这些利用AI绘画的“质量”问题，会让你想表达的内容大打折扣。
StableDiffusion为我们提供了一系列让你的图像变得更加“高清”的方式。这里的高清，不仅仅是物理意义上地让分辨率变得“更大”，还包括对画面细节的全方位完善。
花上十分钟时间，看完这节课，掌握高分辨率/高清修复（Hi-Res Fix）、SD放大（SD Upscale）与附加功能放大这三种实用的图像放大方式，你的AI绘画产出质量一定会“更上一层楼”！
课程视频
3种WebUI中的基础放大方式
高清修复
文生图中常用放大手法，本质是“再做一次图生图”，效果不错，但速度慢且吃显存
SD放大
图生图中常用放大手法，将图片拆成小块重绘再拼合，效果不错，可以有效突破显存上限，但容易造成画面混乱
目前，SD放大有较多替代方案，例如：
Ultimate Upscale扩展： 第8课：扩展安装与推荐
Tiled Diffusion + ControlNet Tile： 扩展应用：超清放大Tiled Diffusion & VAE + ControlNet Tile模型，低显存打造AI绘画超高清6K分辨率体验！
后期处理
通用放大手法，会让细节变得更加锐利清晰，速度非常快但效果一般
Q：网上很多作品都是4K、2K分辨率的图，分辨率高而且细节质感丰富，它们确是直接出的图还是也经过修复放大后的呢？
A：是的，一定经过了高清修复：
直接使用高清修复压力会比较大，但有一些创作者会先高清修复到中等分辨率级别（1000-2000），再借助SD放大或者USU（第8课有介绍）、Tile等工具放大到超高分辨率（3000-4000）；
这个工作流程在后面的视频中进行了详细介绍，感兴趣可以查阅： 扩展应用：超清放大Tiled Diffusion & VAE + ControlNet Tile模型，低显存打造AI绘画超高清6K分辨率体验！
Q：高清修复与直接固定种子提高分辨率直接再画一张有什么区别，或者说有什么优势？
A：这个问题，可以从两个方面来解答：
首先，直接固定种子提高分辨率的方式本质上是不存在的。因为同一个随机种子数，在不同分辨率下的生成过程会有非常大的不同。因此，我们无法借助随机种子实现分辨率的升级。
其次，高清修复本身就是一种“图生图”，因为有了第一次生成的低质量图片作为一个”参考系“，才能有效固定住画面内容，这是使用高清修复的意义所在。
Q：使用SD放大，做出来的图片有四个人/很混乱？
A：一句话：降低重绘幅度，提高缓冲带宽度。
看视频，里面有详细讲解这两项参数的作用。
知识图谱（总结思维导图）
图片生成信息
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1girl, detailed background filled with (many:1.1) (colorful:1.1) (flowers):1.1, (quality:1.1), (photorealistic:1.1), (resolution:1.1), (sharpness:1.1), (cinematic lighting), depth of field, Canan EOS R6, 135mm, 1/1250s, f/2.8, ISO 400, white cloth with (lace trim:1.3), close-up, portrait, SFW,
Negative prompt: NSFW, NG_DeepNegative_V1_75T, child, lowres, worst quality, low quality, blurry, fake, 3d, anime, bad anatomy, disabled body,disgusting,ugly, text, watermark,
Steps: 20, Sampler: Euler, CFG scale: 8, Seed: 2592379013, Size: 500x750, Model hash: be39b34a53, Model: 真实系：lofi_V2, Denoising strength: 0.3, Clip skip: 2, ENSD: 31337, Hires upscale: 2, Hires upscaler: Latent
Negative prompt: NSFW, NG_DeepNegative_V1_75T, child, lowres, worst quality, low quality, blurry, fake, 3d, anime, bad anatomy, disabled body,disgusting,ugly, text, watermark,
Steps: 20, Sampler: Euler, CFG scale: 8, Seed: 2592379013, Size: 500x750, Model hash: be39b34a53, Model: 真实系：lofi_V2, Denoising strength: 0.3, Clip skip: 2, ENSD: 31337, Hires upscale: 2, Hires upscaler: Latent
JavaScript
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SFW, (1girl:1.3), long hair, red hair, face, front, looking at viewer, orange|red dress, upper body, standing, outdoor, chinese traditional clothes, palace,
(masterpiece:1.2), best quality, highres, original, extremely detailed wallpaper, perfect lighting,(extremely detailed CG:1.2),
Negative prompt: NSFW, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, age spot, (ugly:1.331), (duplicate:1.331), (morbid:1.21), (mutilated:1.21), (tranny:1.331), mutated hands, (poorly drawn hands:1.5), blurry, (bad anatomy:1.21), (bad proportions:1.331), extra limbs, (disfigured:1.331), (missing arms:1.331), (extra legs:1.331), (fused fingers:1.61051), (too many fingers:1.61051), (unclear eyes:1.331), lowers, bad hands, missing fingers, extra digit,bad hands, missing fingers, (((extra arms and legs))),
Steps: 20, Sampler: DPM++ SDE Karras, CFG scale: 8, Seed: 2134139580, Size: 728x728, Model hash: 038ba203d8, Model: 二次元：AbyssOrangeMix2_sfw, Denoising strength: 0.5, Clip skip: 2, ENSD: 31337, Mask blur: 4, SD upscale overlap: 128, SD upscale upscaler: R-ESRGAN 4x+ Anime6B
(masterpiece:1.2), best quality, highres, original, extremely detailed wallpaper, perfect lighting,(extremely detailed CG:1.2),
Negative prompt: NSFW, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, age spot, (ugly:1.331), (duplicate:1.331), (morbid:1.21), (mutilated:1.21), (tranny:1.331), mutated hands, (poorly drawn hands:1.5), blurry, (bad anatomy:1.21), (bad proportions:1.331), extra limbs, (disfigured:1.331), (missing arms:1.331), (extra legs:1.331), (fused fingers:1.61051), (too many fingers:1.61051), (unclear eyes:1.331), lowers, bad hands, missing fingers, extra digit,bad hands, missing fingers, (((extra arms and legs))),
Steps: 20, Sampler: DPM++ SDE Karras, CFG scale: 8, Seed: 2134139580, Size: 728x728, Model hash: 038ba203d8, Model: 二次元：AbyssOrangeMix2_sfw, Denoising strength: 0.5, Clip skip: 2, ENSD: 31337, Mask blur: 4, SD upscale overlap: 128, SD upscale upscaler: R-ESRGAN 4x+ Anime6B
(1girl:1.3), close up, long hair, red hair, face, front, looking at viewer, white dress, upper body, standing, chinese traditional clothes, outdoor, (masterpiece:1.2), best quality, highres, original, extremely detailed wallpaper, perfect lighting,(extremely detailed CG:1.2),
Negative prompt:
NSFW, (worst quality:2), (low quality:2), (normal quality:2), lowres, normal quality, ((monochrome)), ((grayscale)), skin spots, acnes, skin blemishes, age spot, (ugly:1.331), (duplicate:1.331), (morbid:1.21), (mutilated:1.21), (tranny:1.331), mutated hands, (poorly drawn hands:1.5), blurry, (bad anatomy:1.21), (bad proportions:1.331), extra limbs, (disfigured:1.331), (missing arms:1.331), (extra legs:1.331), (fused fingers:1.61051), (too many fingers:1.61051), (unclear eyes:1.331), lowers, bad hands, missing fingers, extra digit,bad hands, missing fingers, (((extra arms and legs))),
Steps: 20, Sampler: DPM++ SDE Karras, CFG scale: 10, Seed: 822083670, Size: 600x600, Model hash: 038ba203d8, Model: AbyssOrangeMix2_SFW, Denoising strength: 0.7, Clip skip: 2, ENSD: 31337, Mask blur: 4
masterpiece,best quality,1girl, black skirt, branch, building, chain-link fence, cherry blossoms, fence, long hair, outdoors, petals, pleated skirt, rain, shirt, short sleeves, skirt, solo, standing, tree,sky,street, upper body,
Negative prompt:
badhandv4, EasyNegative, verybadimagenegative_v1.3,illustration, 3d, sepia, painting, cartoons, sketch, (worst quality:2), (low quality:2), (normal quality:2), lowres, bad anatomy, normal quality, ((monochrome)), ((grayscale))
Steps: 50, Sampler: Euler a, CFG scale: 8, Seed: 1173118963, Size: 640x360, Model hash: 7d19f9efad, Model: tmndMix_tmndMixPlus, Denoising strength: 0.3, Clip skip: 2, ENSD: 31337, Hires upscale: 2.5, Hires upscaler: R-ESRGAN 4x+, Eta: 0.67
