[ChatGPT] How to think about and fix the "grainy" look in AI illustrations
✦ What you will learn in this article
The causes of AI illustrations becoming "grainy", and a discussion on choosing words to subtract rather than add.
We will gradually smooth out the parts that look noisy when viewed up close.
At the end, I will also provide a cleanup prompt that you can use as-is.
✦ What does "grainy" mean?
It refers to a state where the image has too much information, making it look rough or gritty.
The overall image isn't bad, but it looks overly detailed and restless when you get close.
That is the kind of impression it gives.
🔘 Hair is drawn too much, strand by strand
🔘 Lines increase and look finely jittery
🔘 Highlights increase like tiny grains
🔘 Shadows and clothing wrinkles are unnecessarily detailed
🔘 It becomes "noisy" rather than "cute"
✦ Why does it happen?
It is often because you are packing too much "detail" into your prompt.
🔘 Layering high detail / ultra detailed
🔘 Packing in "fine hair," "delicate lines," and "translucency" all at once
🔘 Increasing detail to try and match a reference image
If you are using English, I feel that words like "ultra detailed" or "highly detailed hair" are particularly prone to causing this buildup.
It is not that these words are bad, but when used together, the AI tends to interpret it as "I should draw the hair, lines, shadows, and highlights in high detail."
As a result, the hair may split into fine strands or the lines may become too numerous, causing the whole image to look noisy.
✦ What happens if you keep fixing it in the same chat
In the same chat, I get the impression that repeatedly adding "do more of this" makes the graininess more likely to appear.
It might be because previous instructions pile up every time you make a correction.
The AI keeps adding more detail little by little, and before you know it, the noise increases.
✅ When you can't get it right no matter how many times you fix it, start a new chat once
✅ Organize your corrected prompt and rebuild it from scratch
When you hit a wall, it is often faster to "reset and rebuild" than to keep adding more.
✦ It also happens in wide shots
It is also easy for graininess to occur in compositions where the subject appears small.
In full-body or long shots, the details of the face, hair, and clothing are packed into a small area.
As a result, even with the same level of detail, it tends to look like noise.
🔘 Reduce detail even further for long shots
🔘 If you want to show details, use a close-up (bust-up)
🔘 For images used at a small size, prioritize clarity of form
I feel that 'if it's going to be small, don't make it detailed' is just about right.
✦ The trap of reference images
When looking at reference images, you might be tempted to write 'fine hair,' 'fluffy,' or 'delicate lines'.
However, if you look closely at those images, what makes them work is often not the detail.
🔘 Large hair bundles
🔘 Fewer lines
🔘 Rounded silhouettes
🔘 Flat color planes
🔘 Minimal shadows
🔘 Large white highlights
If you want to get closer to a 'rough and cute art style,' I feel that telling the AI to organize the drawing rather than adding detail will get you closer.
✦ The concept of subtracting
The point is to include not only words that increase detail but also words that decrease it.
✅ Hair in large bundles, not individual strands
✅ Reduce the number of lines, shadows, and highlights
✅ Instead of 'high definition,' use 'organized, simple, flat'
I get the impression that specifying 'what to omit' makes the results more stable.
This is just my own way of doing things, but I try to balance instructions for adding and instructions for subtracting about 50/50.
✦ Writing styles that easily lead to 'graininess'
For reference, here are examples of writing styles that easily produce noise.
オリジナルのアニメ風イラスト。淡い金髪ロングの女の子、白いざっくりニット、窓辺。
髪は一本一本まで細かく描く。繊細な後れ毛をたくさん、ふわふわの細い毛束。
高精細、超繊細な線画、たくさんの細かいハイライト、小さな光の粒。
ニットの編み目とシワを細かく描き込む、複雑な影、リアルな質感。
とにかく描き込みを増やした、緻密で情報量の多いイラスト。
When words like 'detailed,' 'many,' and 'high definition' overlap, the AI increases the amount of detail.
From here, if you replace them with the 'subtraction instructions' mentioned earlier, it will look cleaner.
✦ Anti-graininess prompt
These are subtraction instructions you can add as-is.
細かく描き込みすぎない
線数は少なめ
大きな毛束でまとめる
髪の毛一本一本を描かない
影は最小限
フラット寄りのセル塗り
シンプルな色面
ハイライトは大きめに少なく
服のシワは少なめ
ノイズの少ない整理された絵✦ Be specific in your negative prompts
Instead of just writing 'bad quality,' specifically forbid what you don't like.
If you don't like 'too many hair lines,' explicitly forbid that.
細かすぎる髪の線, 髪の毛一本一本の描写, 過剰なハイライト, 小さい光の粒, ざらざらした線, ノイズ, ごちゃごちゃした描き込み, 複雑な影, 服の細かすぎるシワ, 写実的な質感, 厚塗り, 線が多すぎる, 汚い線, 背景の模様, 文字, ロゴ, 透かし✦ If it has already appeared
It is easier to fix by asking it to 'clean up' rather than recreating it from scratch.
この画像のキャラクター性と構図は保ったまま、全体の描き込みを整理してください。
髪の細かすぎる線を減らし、大きな毛束にまとめてください。
線画は少し太めでシンプルにしてください。
小さなハイライトや細かい影を減らし、白い大きなツヤだけを残してください。
服のシワを減らし、大きな影だけで表現してください。
全体をフラット寄りのセル塗りにして、ノイズの少ないすっきりしたアニメイラストにしてください。
顔、髪型、服、ポーズ、背景は大きく変えないでください。
文字・ロゴは入れないでください。If you say 'make it cleaner,' the AI might add even more detail.
When fixing, the trick is to 'reduce, group, or organize' rather than add.
✦ Keywords for fixing
When you want to rephrase briefly, these are easy to use.
線を整理する
髪の束を大きくまとめる
細かい毛を減らす
影を減らす
色面をシンプルにする
ハイライトを少なく大きくする
ノイズを減らす
すっきりしたセル塗りにする
✦ Summary
The cause of noise is usually too much information being added.
There are only three points for today.
✅ Specify hair as large locks rather than individual strands
✅ Include instructions to reduce lines, shadows, and highlights
✅ Prioritize 'organized, simple, flat' over 'high definition'
And when it has already appeared, instead of saying 'make it cleaner,' be specific by saying 'reduce lines, group surfaces, and reduce shadows.'
Remembering that it can also be caused by over-editing or wide-angle compositions, not just words, makes it easier to fix.
I feel that the cuter the art style, the more a 'well-organized shape' looks quietly powerful compared to fine detail.
Thank you for reading. See you in the next article.
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