Legacy ImageMagick Discussions Archive

Hi,

In TIFF-to-JPEG conversion, we are losing transparency and background becomes black.

Command Used:
convert -units pixelsperinch -resample 72 Input.tif[0] output.jpg
and
convert -units pixelsperinch -resample 72 -background none Input.tif[0] output.jpg

How to maintain background transparency?

Identify -verbose Input.tif:
Mime type: image/tiff
Class: DirectClass
Geometry: 1900x2410+0+0
Resolution: 300x300
Print size: 6.33333x8.03333
Units: PixelsPerInch
Type: TrueColorAlpha
Base type: TrueColor
Endianess: MSB
Colorspace: sRGB
Depth: 8/16-bit
Channel depth:
red: 16-bit
green: 16-bit
blue: 16-bit
alpha: 8-bit
Channel statistics:
Red:
min: 0 (0)
max: 255 (1)
mean: 80.6859 (0.316415)
standard deviation: 75.0755 (0.294414)
kurtosis: -1.88561
skewness: -0.104343
Green:
min: 0 (0)
max: 255 (1)
mean: 108.424 (0.425192)
standard deviation: 100.28 (0.393253)
kurtosis: -1.95729
skewness: -0.144818
Blue:
min: 0 (0)
max: 255 (1)
mean: 132.391 (0.519181)
standard deviation: 122.298 (0.4796)
kurtosis: -1.96784
skewness: -0.15297
Alpha:
min: 0 (0)
max: 255 (1)
mean: 135.409 (0.531017)
standard deviation: 126.977 (0.49795)
kurtosis: -1.98224
skewness: 0.123055
Image statistics:
Overall:
min: 0 (0)
max: 255 (1)
mean: 110.273 (0.432443)
standard deviation: 108.135 (0.424057)
kurtosis: -1.7011
skewness: 0.129453
Alpha: none #00000000
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)
Background color: white
Border color: srgba(223,223,223,1)
Matte color: grey74
Transparent color: none
Interlace: None
Intensity: Undefined
Compose: Over
Page geometry: 1900x2410+0+0
Dispose: Undefined
Iterations: 0
Compression: LZW
Orientation: TopLeft
Properties:
date:create: 2015-01-19T07:15:19-06:00
date:modify: 2015-01-19T07:15:19-06:00
dc:format: image/tiff
exif:DateTimeDigitized: 2007:09:05 13:35:45
exif:DateTimeOriginal: 2007:09:05 13:35:45
exif:ISOSpeedRatings: 50
exif:PixelXDimension: 1900
exif:PixelYDimension: 2410
icc:name: IEC 61966-2.1 Default RGB colour space - sRGB
photoshop:AuthorsPosition: RACHEL WATSON
photoshop:ColorMode: 3
photoshop:DateCreated: 2007-09-05T13:35:45
photoshop:History: 2012-10-02T14:00:55-04:00 File CT2226_MilitaryGreen.PSD opened
2012-10-02T14:05:36-04:00 File CT2226_BirdsEgg_YJJ.PSD saved
2012-10-02T14:05:49-04:00 File CT2226_BirdsEgg_YJJ.tif saved
2012-10-03T16:15:20-04:00 File CT2226_BirdsEgg_YJJ.tif opened
2012-10-03T16:15:55-04:00 File CT2226_BirdsEgg_YJJ.tif saved
2012-10-03T16:18:13-04:00 File CT2226_FatiqueGreen_VZB.PSD saved
2012-10-03T16:18:20-04:00 File CT2226_FatiqueGreen_VZB.tif saved
2012-10-03T16:19:05-04:00 File CT2226_Sungold_YJP.PSD saved
2012-10-03T16:19:11-04:00 File CT2226_Sungold_YJP.tif saved
2012-12-06T12:23:41-05:00 File CT2112_Sungold_YJP.tif opened
2012-12-06T12:26:51-05:00 File CT2112_Sungold_YJP.PSD saved

photoshop:ICCProfile: sRGB IEC61966-2.1
photoshop:Source: SHOOT-03
photoshop:Urgency: 1
rdf:Alt:


rdf:Bag:




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stRef:originalDocumentID: uuid:A6BDF9B49A5A11DD9EAF9897613A49E6
tiff:alpha: unassociated
tiff:artist: RACHEL WATSON
tiff:endian: msb
tiff:make: Phase One
tiff:model: H 25
tiff:photometric: RGB
tiff:rows-per-strip: 22
tiff:software: Adobe Photoshop CS5 Macintosh
tiff:timestamp: 2014:10:02 17:32:49
xmp:CreateDate: 2007-09-05T13:35:45
xmp:CreatorTool: Adobe Photoshop CS5 Macintosh
xmp:MetadataDate: 2014-10-02T17:32:49-04:00
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Clipping path:
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Profiles:
Profile-8bim: 13688 bytes
Profile-icc: 3144 bytes
Profile-tiff:37724: 58205104 bytes
Profile-xmp: 41688 bytes
Artifacts:
filename: Input.tif
verbose: true
Tainted: False
Filesize: 61.68MB
Number pixels: 4.579M
Pixels per second: 5.451MB
User time: 0.380u
Elapsed time: 0:01.839

JPEG does not support transparency, so "none" is black. Use "-background white" (or whatever color you'd like the
transparent parts to become).

glennrp wrote:JPEG does not support transparency, so "none" is black. Use "-background white" (or whatever color you'd like the
transparent parts to become).

Hi,

We have tried above options, but still issue exists. We also tried without "background" option in the command. In both cases, background became black

I would explicitly flatten, eg:
Note: I resample after reading the input. I don't know if that is better, as you have a clipping path.

snibgo wrote:I would explicitly flatten, eg:

Code: Select all

convert Input.tif[0] -units pixelsperinch -resample 72 -background white -flatten output.jpg

Note: I resample after reading the input. I don't know if that is better, as you have a clipping path.

Thanks, Above command working fine for this image. But, we cannot include "-background white -flatten " for all images, as other images may have different background other than white

How to detect that the image has transparent background?

If the image has no transparency, "-flatten" will do nothing.

If you want to keep transparency, you need to save to some other format but JPEG, such as PNG or TIFF. Perhaps JP2000 supports transparency? I do not know. But plain JPEG will not keep transparency. So you either have to flatten against some other color besides black or transparent or none, such as white, or use another output format, such as PNG or TIFF

Carter J wrote:

snibgo wrote:I would explicitly flatten, eg:

Code: Select all

convert Input.tif[0] -units pixelsperinch -resample 72 -background white -flatten output.jpg

Note: I resample after reading the input. I don't know if that is better, as you have a clipping path.

Above command not working for all files..For some files, we still facing same problem..

Any suggestions?

Put a sample file on dropbox.com or somewhere and paste the link here. Say what command you are using, with what version of IM.

Hi,
Below is the link for InputFile:
https://www.dropbox.com/s/1gh3xf99ohlco ... e.tif?dl=0

Command tried:
convert -alpha off Input.tif[0] -units pixelsperinch -resample 72 -background white -flatten output.jpg

We are a generic command for all types of files, so using "-alpha off" to resolve issue with below type of files, as discussed in URL viewtopic.php?p=119940#p119940

link for InputFIle:
https://www.dropbox.com/s/7t2qkk9yzaops ... e.tif?dl=0

Please suggest

We are still facing this issue, any help ?

Which version of ImageMagick are you using? I get an image with a white background when I run the command above for both images. Can you clarify your issue?

I don't understand what issue you are facing.

When an image has transparency but you need an opaque output, you can either (a) turn the transparency off or (b) flatten against some solid colour or (c) something strange like flatten against some other image.