在stable-diffusion v2.1发布一个月后，终于有国内网站上了SD2.1的模型，可以免费体验。
先放上体验网址：https://www.aizuohua.com/
注册之后，模型选择stable-diffusion v2.1，每天可以免费体验20张图，不论图片尺寸（除sd2.1以外，还有1.5版本以及anything V3、momoko等二次元模型）。
1.Stable Diffusion2.1在一定程度上可以涩涩，人物图像更丰富
和Stable Diffusion2.0相比，2.1版本在成人内容放宽了限制，进一步提升了人像精度。
此前2.0版本为了过滤涩情内容，采用了NSFW过滤器，但是过于严格的过滤和人像训练素材的减少也造成了2.0版本人像图片很容易出问题。
官方在2.1版本做出了调整，对过滤器减少了限制，使得人物图像更加丰富，但是调整并不是取消，2.1仍然会对成人内容做出限制。
2.Stable Diffusion2.1版本在建筑、室内设计和自然景观等方面的呈现效果有飞跃式提升
Stable Diffusion2.0版本在建筑概念和自然风光的图像质量上就有很大突破，2.1在2.0的基础上实现了进一步的提升，加强了生成图像的精细度，更适合来做一些宏伟的景象以及相关专业的辅助设计。
3.加强否定提示的能力
Stable Diffusion2.1版本对否定提示提示能力做了增强，从而更好的帮助用户过滤掉一些负面信息，比如噪点、模糊、手指缺失、重影、多于的人物等等，进一步提升了生成图片的质量。
根据没有反向提示词（左）和有反向提示词（右）生成图片的比较，可以发现后者在细节方面更加完美。
目前，从用户反馈来看，对stable-diffusion v2.1褒贬不一，很多人觉得效果还不如此前的1.5版本。
我个人体验感觉2.1的图更偏写实，很多细节刻画比1.5更丰富，应该是对建筑类做过更多的训练，出图会更稳定，但是人像出图不太稳定，对描述词要求很高。
贴一些我自己用SD2.1画的图：
人像：
A lovely little girl, fantasy, highly detailed, digital painting, art station, conceptual art, smooth, keen focus, illustration,, highly detailed, digital painting, trend in art station,
A realistic portrait of a young girl, long brown hair, future city, highly detailed, digital painting, trend in art station, pixiv, conceptual art, keen focus, illustration, art author: Ross Tran and Greg Rutkowski and Walt Disney animation
breathtaking Portrait fairy by Miho Hirano, realistic, detailed and beautiful collage technology, including butterflies, gorgeous backgrounds, art stations, oil paintings, digital paintings, trends in art stations, pixiv, conceptual art, keen focus, illustrations, art authors: Ross Tran and Greg Rutkowski and Walt Disney animation, dramatic lighting, eternal, high-quality printing, fine redshift rendering art
realistic portrait of a young teen girl, blue hair, dark fantasy, dark style outfit,headphones with bunny ears super short hair, casting a bright large-scale magical steam punk like city, magic dust around, highly detailed, digital painting, trending on artstation, pixiv, concept art, sharp focus, illustration, art by Ross Tran and Greg Rutkowski and Walt Disney animation
建筑：
Futuristic sci fi city in the style of santiago calatrava. Utopia. skyscrapers, flying cars, science fiction fantasy movies. Fantastic perspective view. 3d rendering. futuristic exterior fluid curves strong lines, rich vibrant detailed texture design architecture, bright natural ambient light + archviz + octane render + realistic photography+ artstation, metallic reflections, 14mm wide lens
3d rendering of beautiful nature meets architecture concept of a residential house by Kengo Kuma, volumetric lighting, luxury, high detail, 14mm, glass railing, outdoor staircase, terraces, roof garden, cinematic photography, cg architects, high resolution
自然景观：
a halloween landscape in november, by Ernest deutsch + Ted Nasmith, cinematic lighting, masterpiece, highly detailed, 8k resolution, trending on art station
a landscape of heaven, realism, hd, epic
painting of a winter landscape, intricate, fantasy, highly detailed, digital painting, artstation, concept art, sharp focus, illustration, art by artgerm and greg rutkowski and alphonse mucha
感兴趣的朋友可以去试一下哦，大家如果有什么2.1的描述技巧也欢迎评论区分享。
声明：相关模型介绍和部分图片资料整理自网络，如有侵权，联系删除
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