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#573: And error message.
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@ -52,7 +52,7 @@ final class LuminanceToGray implements RasterOp {
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public WritableRaster filter(final Raster src, WritableRaster dest) {
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public WritableRaster filter(final Raster src, WritableRaster dest) {
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Validate.notNull(src, "src may not be null");
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Validate.notNull(src, "src may not be null");
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Validate.isTrue(src != dest, "src and dest raster may not be same");
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Validate.isTrue(src != dest, "src and dest raster may not be same");
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Validate.isTrue(src.getNumDataElements() >= 3, src.getNumDataElements(), "Luma raster must have at least 3 data elements: %s");
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Validate.isTrue(src.getNumDataElements() >= 3, src.getNumDataElements(), "luminance raster must have at least 3 data elements: %s");
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if (dest == null) {
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if (dest == null) {
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dest = createCompatibleDestRaster(src);
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dest = createCompatibleDestRaster(src);
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