image parsing issue

[Krisna Pranav]

hey @suyashkumar I am facing a issue:

• if I run the code:

package main

import (
	"fmt"
	"image/jpeg"
	"os"

	"github.com/suyashkumar/dicom"
	"github.com/suyashkumar/dicom/pkg/tag"
)

func main() {
	dataset, _ := dicom.ParseFile("dicom/test.dcm", nil)
	pixelDataElement, _ := dataset.FindElementByTag(tag.PixelData)
	pixelDataInfo := dicom.MustGetPixelDataInfo(pixelDataElement.Value)
	for i, fr := range pixelDataInfo.Frames {
		img, _ := fr.GetImage()
		f, _ := os.Create(fmt.Sprintf("image_%d.jpg", i))
		_ = jpeg.Encode(f, img, &jpeg.Options{Quality: 200})
		_ = f.Close()
	}
}

it is giving an output image as jpg but it is full dark

[Krisna Pranav]

reference:

[Krisna Pranav]

if I use other converter to convert the dicom file I get the result:

[Krisna Pranav]

can you help me to fix this issue

[Krisna Pranav]

Hi @krishpranav are you getting the EOF error reported earlier, or just an apparently dark image? The image appearing black may be working as intended, because we do not apply any pixel value auto scaling yet: https://github.com/suyashkumar/dicom/blob/87c7d7e41fca7227af3582174c5933fb91981eb7/README.md?plain=1#L57

Also, regarding the images you posted, by posting them I assume you have the license to post those and that they are de-identified (they appear to be, but that is for you to determine as the poster--if not, please delete those comments).

If you're not getting the EOF error, and it is not working-as-intended due to no auto scaling being applied, please open another issue instead of this one. Thanks!

[Krisna Pranav]

I have saw you comment after going to (in Preview on mac, go to Tools->Adjust Color). what to do any ideas??

[Krisna Pranav]

is there any updates???

[Suyash Kumar]

Hi @krishpranav to answer your question:

I have saw you comment after going to (in Preview on mac, go to Tools->Adjust Color). what to do any ideas??

You can move the sliders around to change the scaling of the raw pixel values in the image. The values written out to the PNG by this library should be the same raw integer values inside the dicom. It can sometimes be important to preserve these values, because they can often times map to real world units (like HU). You can also programmatically apply whatever autoscaling you wish to the integer values retrieved from the DICOM (simply access the Data slice in the NativeFrame).

If things still seem off, we can try to debug further!

[Suyash Kumar]

(resolving as this seems to have been addressed in the above comment)