How to add half filter on snapchat?

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take a picture of your choice and then put the filter half and half of what you want then while still holding your finger down on the filter click the "T" button at the same time and it will stay   more
To do a half filter you go to the filter you want and slide it so that way the line is in the middle. Then you hold it there and press the draw button. Then press undo if it made a mark on your photo.   more
... iOS and Android. Before applying filter, go to Settings and ... enable features related to filters and effects then while ... that. Another possibility to apply filters is by drawing a gesture while ...   more

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