May I know how to use this library to convert to TIFF to android bitmap?

[Jimex]

May I know how to use this library to convert to TIFF to android bitmap?

Thank you.

[bosborn]

Here is an example of converting a RBG tiff (example) to a Bitmap

TIFFImage tiffImage = TiffReader.readTiff(/* file, bytes, reader, or stream */);
FileDirectory fileDirectory = tiffImage.getFileDirectory();

Rasters rasters = fileDirectory.readRasters();
int width = rasters.getWidth();
int height = rasters.getHeight();

Bitmap bitmap = null;

switch(fileDirectory.getPhotometricInterpretation()){

    case TiffConstants.PHOTOMETRIC_INTERPRETATION_RGB:

        bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                Number[] pixel = rasters.getPixel(x, y);
                int color = Color.rgb(pixel[0].intValue(), pixel[1].intValue(), pixel[2].intValue());
                bitmap.setPixel(x, y, color);
            }
        }

        break;

    default:

}

[Jimex]

Thank you for the reply!
I have tried it and it works, however, the image quality becomes bad after conversion.

Before

After

[bosborn]

It probably just depends on how the TIFF is encoded, can you post the actual TIFF file?

[Jimex]

Yes, I think it might be related to the foramt of the TIFF too, I tried decode the tiff file by using UTIF.js and it could be display well.

Here is the actual TIFF file, thank you.

test-tiff.zip

[bosborn]

That tiff file has predictor compression (in addition to LZW). Predictor decoding is currently not implemented.

Until implemented, here is a workaround that worked for your image:

TIFFImage tiffImage = TiffReader.readTiff(/* file, bytes, reader, or stream */);
FileDirectory fileDirectory = tiffImage.getFileDirectory();

Rasters rasters = fileDirectory.readRasters();
int width = rasters.getWidth();
int height = rasters.getHeight();

Bitmap bitmap = null;

switch(fileDirectory.getPhotometricInterpretation()){

    case TiffConstants.PHOTOMETRIC_INTERPRETATION_RGB:

        Integer predictor = fileDirectory.getIntegerEntryValue(FieldTagType.Predictor);
        boolean horizontalPredictor = predictor != null && predictor == 2;

        bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);

        for (int y = 0; y < height; y++) {
            Number[] previousPixel = null;
            for (int x = 0; x < width; x++) {
                Number[] pixel = rasters.getPixel(x, y);
                if(previousPixel != null){
                    for(int sample = 0; sample < pixel.length; sample++){
                        pixel[sample] = (pixel[sample].intValue() + previousPixel[sample].intValue()) % 256;
                    }
                }
                int color = Color.rgb(pixel[0].intValue(), pixel[1].intValue(), pixel[2].intValue());
                bitmap.setPixel(x, y, color);
                if(horizontalPredictor) {
                    previousPixel = pixel;
                }
            }
        }

        break;

    default:

}

[Jimex]

Amazing, it works like a charm now, and the speed is 5x faster than the previous one.

Thank you very much!

[bosborn]

After updating to version 3.0.0, you should be able to revert back to the previous answer.

[Jimex]

Thank you for the update, I have updated my code accordingly.

By the way, does this library still cannot support the grayscale TIFF? I got the following error when I try to convert some black-and-white tiff to bitmap.

W/System.err: mil.nga.tiff.util.TiffException: Unsupported field type for sample format: 1, bits per sample: 4
W/System.err: at mil.nga.tiff.FieldType.getFieldType(FieldType.java:185)
W/System.err: at mil.nga.tiff.FileDirectory.getFieldTypeForSample(FileDirectory.java:1383)
W/System.err: at mil.nga.tiff.FileDirectory.readRasters(FileDirectory.java:1212)
W/System.err: at mil.nga.tiff.FileDirectory.readRasters(FileDirectory.java:1067)
W/System.err: at mil.nga.tiff.FileDirectory.readRasters(FileDirectory.java:1019)
W/System.err: at mil.nga.tiff.FileDirectory.readRasters(FileDirectory.java:998)

The file format as below:
Image:
Format: TIFF (Tagged Image File Format)
Mime type: image/tiff
Class: PseudoClass
Geometry: 2115x3123+0+0
Resolution: 300x300
Print size: 7.05x10.41
Units: PixelsPerInch
Colorspace: sRGB
Type: Grayscale
Base type: Palette
Endianness: LSB
Depth: 4/8-bit
Channel depth:
Red: 8-bit
Green: 8-bit
Blue: 8-bit
Channel statistics:
Pixels: 6605145
Red:
min: 0.0588235 (0.00392157)
max: 15 (1)
mean: 13.1515 (0.876767)
median: 15 (1)
standard deviation: 4.68201 (0.312134)
kurtosis: 3.28602
skewness: -2.26044
entropy: 0.242478
Green:
min: 0.0588235 (0.00392157)
max: 15 (1)
mean: 13.1515 (0.876767)
median: 15 (1)
standard deviation: 4.68201 (0.312134)
kurtosis: 3.28602
skewness: -2.26044
entropy: 0.242478
Blue:
min: 0.0588235 (0.00392157)
max: 15 (1)
mean: 13.1515 (0.876767)
median: 15 (1)
standard deviation: 4.68201 (0.312134)
kurtosis: 3.28602
skewness: -2.26044
entropy: 0.242478
Image statistics:
Overall:
min: 0.0588235 (0.00392157)
max: 15 (1)
mean: 13.1515 (0.876767)
median: 15 (1)
standard deviation: 4.68201 (0.312134)
kurtosis: 3.28602
skewness: -2.26044
entropy: 0.242478
Colors: 16
Histogram:
594702: (1,1,1) #010101 srgb(1,1,1)
57392: (23,23,23) #171717 grey9
38617: (39,39,39) #272727 srgb(39,39,39)
34549: (55,55,55) #373737 srgb(55,55,55)
29419: (71,71,71) #474747 grey28
27644: (87,87,87) #575757 grey34
26836: (104,104,104) #686868 srgb(104,104,104)
22060: (120,120,120) #787878 grey47
21871: (135,135,135) #878787 grey53
23120: (152,152,152) #989898 srgb(152,152,152)
21422: (168,168,168) #A8A8A8 grey66
20607: (183,183,183) #B7B7B7 srgb(183,183,183)
20740: (200,200,200) #C8C8C8 srgb(200,200,200)
19368: (215,215,215) #D7D7D7 srgb(215,215,215)
24403: (231,231,231) #E7E7E7 srgb(231,231,231)
5622395: (255,255,255) #FFFFFF white
Colormap entries: 16
Colormap:
0: (1,1,1,1) #010101FF srgba(1,1,1,1)
1: (23,23,23,1) #171717FF grey9
2: (39,39,39,1) #272727FF srgba(39,39,39,1)
3: (55,55,55,1) #373737FF srgba(55,55,55,1)
4: (71,71,71,1) #474747FF grey28
5: (87,87,87,1) #575757FF grey34
6: (104,104,104,1) #686868FF srgba(104,104,104,1)
7: (120,120,120,1) #787878FF grey47
8: (135,135,135,1) #878787FF grey53
9: (152,152,152,1) #989898FF srgba(152,152,152,1)
10: (168,168,168,1) #A8A8A8FF grey66
11: (183,183,183,1) #B7B7B7FF srgba(183,183,183,1)
12: (200,200,200,1) #C8C8C8FF srgba(200,200,200,1)
13: (215,215,215,1) #D7D7D7FF srgba(215,215,215,1)
14: (231,231,231,1) #E7E7E7FF srgba(231,231,231,1)
15: (255,255,255,1) #FFFFFFFF white
Rendering intent: Perceptual
Gamma: 0.454545
Chromaticity:
red primary: (0.64,0.33)
green primary: (0.3,0.6)
blue primary: (0.15,0.06)
white point: (0.3127,0.329)
Matte color: grey74
Background color: white
Border color: srgb(223,223,223)
Transparent color: none
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 2115x3123+0+0
Dispose: Undefined
Iterations: 0
Compression: LZW
Orientation: TopLeft
Properties:
date:create: 2022-01-15T10:37:22+00:00
date:modify: 2022-01-15T10:37:28+00:00
signature: 0e384137334be05c21be0778319e19422570a68143ed679f10a113d434e0b125
tiff:alpha: unspecified
tiff:endian: lsb
tiff:photometric: palette
tiff:rows-per-strip: 3128
Artifacts:
verbose: true
Tainted: False
Filesize: 525434B
Number pixels: 6.60515M
Pixels per second: 72.118MP
User time: 0.094u
Elapsed time: 0:01.091

[bosborn]

It does support grayscale images, but not 4 bits (half a byte) per sample.
Supports 8, 16, or 32 bits (1, 2, or 4 bytes) per sample for unsigned integers.

[Jimex]

Understood, thank you for the clarification.