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feat(replace-and-invert-colour): Add CMYK color space conversion with prepress preset for PDF processing (#4494)

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Balázs Szücs
2025-09-28 17:39:20 +02:00
committed by GitHub
parent 4ad039d034
commit 07392ed25e
8 changed files with 139 additions and 19 deletions
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1
app/common/src/main/java/stirling/software/common/model/api/misc/ReplaceAndInvert.java
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@@ -4,4 +4,5 @@ public enum ReplaceAndInvert {
HIGH_CONTRAST_COLOR,
CUSTOM_COLOR,
FULL_INVERSION,
COLOR_SPACE_CONVERSION,
}

94
app/common/src/main/java/stirling/software/common/util/misc/ColorSpaceConversionStrategy.java Normal file
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@@ -0,0 +1,94 @@
package stirling.software.common.util.misc;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import org.springframework.core.io.InputStreamResource;
import org.springframework.web.multipart.MultipartFile;
import lombok.extern.slf4j.Slf4j;
import stirling.software.common.model.api.misc.ReplaceAndInvert;
import stirling.software.common.util.ProcessExecutor;
import stirling.software.common.util.ProcessExecutor.ProcessExecutorResult;
@Slf4j
public class ColorSpaceConversionStrategy extends ReplaceAndInvertColorStrategy {
public ColorSpaceConversionStrategy(MultipartFile file, ReplaceAndInvert replaceAndInvert) {
super(file, replaceAndInvert);
}
@Override
public InputStreamResource replace() throws IOException {
Path tempInputFile = null;
Path tempOutputFile = null;
try {
tempInputFile = Files.createTempFile("colorspace_input_", ".pdf");
tempOutputFile = Files.createTempFile("colorspace_output_", ".pdf");
Files.write(tempInputFile, getFileInput().getBytes());
log.info("Starting CMYK color space conversion");
List<String> command = new ArrayList<>();
command.add("gs");
command.add("-sDEVICE=pdfwrite");
command.add("-dCompatibilityLevel=1.5");
command.add("-dPDFSETTINGS=/prepress");
command.add("-dNOPAUSE");
command.add("-dQUIET");
command.add("-dBATCH");
command.add("-sProcessColorModel=DeviceCMYK");
command.add("-sColorConversionStrategy=CMYK");
command.add("-sColorConversionStrategyForImages=CMYK");
command.add("-sOutputFile=" + tempOutputFile.toString());
command.add(tempInputFile.toString());
log.debug("Executing Ghostscript command for CMYK conversion: {}", command);
ProcessExecutorResult result =
ProcessExecutor.getInstance(ProcessExecutor.Processes.GHOSTSCRIPT)
.runCommandWithOutputHandling(command);
if (result.getRc() != 0) {
log.error(
"Ghostscript CMYK conversion failed with return code: {}. Output: {}",
result.getRc(),
result.getMessages());
throw new IOException(
"CMYK color space conversion failed: " + result.getMessages());
}
log.info("CMYK color space conversion completed successfully");
byte[] pdfBytes = Files.readAllBytes(tempOutputFile);
return new InputStreamResource(new ByteArrayInputStream(pdfBytes));
} catch (Exception e) {
log.warn("CMYK color space conversion failed", e);
throw new IOException(
"Failed to convert PDF to CMYK color space: " + e.getMessage(), e);
} finally {
if (tempInputFile != null) {
try {
Files.deleteIfExists(tempInputFile);
} catch (IOException e) {
log.warn("Failed to delete temporary input file: {}", tempInputFile, e);
}
}
if (tempOutputFile != null) {
try {
Files.deleteIfExists(tempOutputFile);
} catch (IOException e) {
log.warn("Failed to delete temporary output file: {}", tempOutputFile, e);
}
}
}
}
}