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Hero Image Sketch allows you to control outputs using sketch references. Herewe’ll show you how to control the outputs of your generations using line art sketches or doodles and provide you with some starter sketches to play around with. Finallywe will see how to guide the Sketch tool with our own colors.

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Basic Usage

Your Alpaca plugin may look a bit different than in the video as we are constantly improving it.
The Sketch command is controlled by two inputs: The reference sketch will be used to control the form or composition of your image. You can create reference sketcheswith varying degrees of fidelity and detailfrom a simple scribble to a more detailed sketch like the one in the example. Simply alter the Sketch Type in the dropdown box in the Alpaca panel accordingly. The text prompt can be used to specify colourlightingmoodor other details. Belowyou can find some sample sketches and prompts like the ones used in this example.


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Using Colors

You can also get Alpaca to create generation that follow a specific color scheme by providing your own flat colors in addition to your sketch.

To enable color modeunder Sketch Settings set Color Layers to Other Layers if your sketch and colors are in separate layersor to Sketch Layer if you have everything in a single layer.
When using a single layer for sketch and colorsyour sketch line will also affect the colors of the generation. It is better to use separate layers for best qualitythis feature is only here for convenience when doing some rapid testing.
From now onany visible layer that is not your sketching layer will be used to guide your generations. Make sure to keep your sketch layer and colors in separate layer and select your sketch layer before clicking Generate
You can play with Color Strength for more interesting results. This settings controls the fidelity of the generation with regards to your colors. The higher the strength the more Alpaca will respect your colorsbut the less the image will change. To get more creative resultslower the strength.

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Parameters

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Prompt

The Prompt boxlocated in the main section of the Alpaca paneltakes in a text prompt describing the subject matter, compositionand characteristics of your desired image. You can also describe what you do not want to see in the output by clickling on Exclude. You can learn more about writing prompts by checking our our Prompt Guide.

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Images

Allows you to specify how many images you want Alpaca to generate from 1 to 5. The higher the number of imagesthe more credits the generation will costand the slowest it will be.

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Seed

The seed acts as a unique identifierguiding the creation process of each generation. If you retain the same seed with identical settingsthe output will always be the same. Retain the seedwhile changing other parameters (e.g. altering the prompt) and you’ll derive a distinct yet related creation. For an element of unpredictabilityset the seed to 0 and Alpaca will choose a random seed for each imagecreating more variations

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Steps

Higher number of steps will lead to better qualitybut also cost more credits and make the generation slower.

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Sketch Type

You can choose between three Sketch Types — AccurateRoughand Scribbleeach of which will use a particular model built to render that type. Accurate will follow your sketch very closely while Scribble will mostly only follow it’s general composition (great for doodling)Rough falls in the middle.

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Sketch Strength

Controls the degree to which the output adheres to the sketch. A low value allows for a more liberal interpretation of the reference sketchwhile a high value ensures that the sketch outline will be strictly followed.

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Color Layers

Which (visible) layers to use to guide colors:
  • None: No color guidanceAlpaca will generate colors solely based on your prompt and sketch.
  • Other layers: Alpaca will follow the colors contained in your visible layers other except the sketch layer.
  • Sketch layer: Alpaca will follow the colors contained in the same layer that contains your sketch.

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Color Strength

Controls the degree to which changes are made to the underlying color palettein the case where you have checked the Use Color Reference box. A low Color Strength will keep the output close to the original color referencewhile a high value will add more shadinglightingand detail to the output.

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Prompt Strength

The Prompt Strength slider controls the influence of the prompt — higher values of this parameter force the model to be more attentive to the prompt. We can consider this to be a “rigid” vs “relaxed” interpretation of the prompt. 7 is a good balance.