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from fastapi import FastAPI, File, UploadFile, HTTPException
from fastapi.responses import StreamingResponse
from PIL import Image
import io
app = FastAPI(title="Advanced Image Converter")
ALLOWED_OUTPUT_FORMATS = ["jpeg", "png", "gif", "bmp", "tiff", "webp"]
@app.post("/convert_image/")
async def convert_image(
file: UploadFile = File(...),
output_format: str = "jpeg",
quality: int = 95 # For JPEG/WebP, adjust compression quality (0-100)
):
"""
Converts an uploaded image to the specified format.
- Supports common image formats as input.
- Output formats: JPEG, PNG, GIF, BMP, TIFF, WebP.
- For JPEG and WebP, you can adjust the `quality` (0-100).
"""
if output_format.lower() not in ALLOWED_OUTPUT_FORMATS:
raise HTTPException(
status_code=400,
detail=f"Invalid output format. Allowed formats: {', '.join(ALLOWED_OUTPUT_FORMATS)}",
)
if output_format.lower() in ["jpeg", "webp"] and not (0 <= quality <= 100):
raise HTTPException(
status_code=400, detail="Quality must be between 0 and 100 for JPEG and WebP."
)
try:
image = Image.open(io.BytesIO(await file.read()))
except Exception as e:
raise HTTPException(status_code=400, detail="Invalid image file.") from e
output_io = io.BytesIO()
try:
save_kwargs = {}
if output_format.lower() in ["jpeg", "webp"]:
save_kwargs["quality"] = quality
image.save(output_io, format=output_format.upper(), **save_kwargs)
except KeyError:
raise HTTPException(
status_code=400, detail=f"Conversion to {output_format} failed."
)
except Exception as e:
raise HTTPException(status_code=500, detail=f"Image processing error: {e}")
output_io.seek(0)
media_type = f"image/{output_format.lower()}"
if output_format.lower() == "tiff":
media_type = "image/tiff" # Special case for TIFF
return StreamingResponse(output_io, media_type=media_type) |