Image plot looks blurry

Q&A
1

Hii, i am trying to plot a seismic image using the GMT. However the images generated is blurry and to make it higher resolution I tried to change -I option of xyz2grd, however i am not getting higher resolution image. I hope experts will help me overcoming this problem.
what should I have to add in the code so that blurry portion will be clear and illuminated.

I wrote the code as follows

ps=plot.ps

j1=14/-10
r1=100/300/0/10

gmt psxy -JX$j1 -R$r1 -K -P -X4.5 -Y10 </dev/null> $ps
cat input.txt| awk ‘{print $2,$1,$3}’ > data
gmt xyz2grd data -Gdata.grd -I1.0/0.25 -R$r1
gmt grd2cpt data.grd -Cpolar -Z > img.cpt
gmt grdimage data.grd -Cimg.cpt -JX$j1 -R$r1 -K -P -O </dev/null>> $ps
gmt psxy -JX$j1 -R$r1 -Ba50f50g500:“no of sensors”:/a5f0g0:“Time (s)”:NseW -P -O -K </dev/null>> $ps

The generated picture is here plot.ps (37.8 KB)

2

Hi, I am not sure what you are using to view your plot.ps file. I downloaded it and opened it in Adobe Illustrator and it does not look blurry but it looks blurry when I use Apple Preview.
What is the spacing of your original data in the time direction? When you use gmt xyz2grd data -Gdata.grd -I1.0/0.25 then you will be limited in the time direction to the 0.25 seconds spacing you specified.
I attach an export of your picture from Illustrator. It is not blurry, but has large blocks in the time direction because of the 0.25 second spacing.

plot
plot942×695 32 KB

3

Are you asking the sampling rate?
Sampling rate is 300hz

4

Try setting yinc (i.e. time) to 1/300 (0.0033(3333…)).