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About Dimensions
A minimum of 262k pixels and a maximum of 1.04m pixels are recommended when generating images with 512px models, and a minimum of 589k pixels and a maximum of 1.04m pixels for 768px models. The true pixel limit is 1048576.
To avoid the dreaded 6N IndexError it is advised to use 64px increments when choosing an aspect ratio. Popular ratio combinations for 512px models include 1536 x 512 and 1536 x 384, while 1536 x 640 and 1024 x 576 are recommended for 768px models.
For 512px models, the minimum useful sizes are 192-256 in one dimension. For 768px models the minimum useful size is 384 in one dimension.
Generating images under the recommended dimensions may result in undesirable artifacts.
i got it why. https://platform.stability.ai/docs/legacy/grpc-api/features/api-parameters